rhsa-2025:12311
Vulnerability from csaf_redhat
Published
2025-07-30 16:03
Modified
2025-08-20 09:08
Summary
Red Hat Security Advisory: kernel-rt security update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: ipv6: mcast: extend RCU protection in igmp6_send() (CVE-2025-21759)
* kernel: media: uvcvideo: Fix double free in error path (CVE-2024-57980)
* kernel: wifi: iwlwifi: limit printed string from FW file (CVE-2025-21905)
* kernel: ext4: avoid journaling sb update on error if journal is destroying (CVE-2025-22113)
* kernel: mm/huge_memory: fix dereferencing invalid pmd migration entry (CVE-2025-37958)
* kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001)
* kernel: net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done (CVE-2025-38052)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"name": "Double Free"
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"discovery_date": "2025-02-27T00:00:00+00:00",
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"text": "2348599"
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: uvcvideo: Fix double free in error path\n\nIf the uvc_status_init() function fails to allocate the int_urb, it will\nfree the dev-\u003estatus pointer but doesn\u0027t reset the pointer to NULL. This\nresults in the kfree() call in uvc_status_cleanup() trying to\ndouble-free the memory. Fix it by resetting the dev-\u003estatus pointer to\nNULL after freeing it.\n\nReviewed by: Ricardo Ribalda \u003cribalda@chromium.org\u003e",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: media: uvcvideo: Fix double free in error path",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The bug could happen on error path if memory allocation failed. For the Linux Kernel this condition is impossible until system already failed. This type of bugs are complex to trigger (making system out of memory) and considered to affect availability only. The security impact is limited.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-57980"
},
{
"category": "external",
"summary": "RHBZ#2348599",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348599"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-57980",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-57980"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-57980",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57980"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025022634-CVE-2024-57980-4b5a@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025022634-CVE-2024-57980-4b5a@gregkh/T"
}
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{
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"date": "2025-07-30T16:03:08+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"title": "kernel: media: uvcvideo: Fix double free in error path"
},
{
"cve": "CVE-2025-21759",
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"name": "Use After Free"
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"ids": [
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net-\u003eipv6.igmp_sk\nsocket under RCU protection.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ipv6: mcast: extend RCU protection in igmp6_send()",
"title": "Vulnerability summary"
},
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"text": "The patch extends RCU protection in igmp6_send() to prevent a potential use-after-free (UAF) when accessing net-\u003eipv6.igmp_sk. This function could be invoked without holding RTNL or RCU, making concurrent access unsafe in network namespace contexts. The fix replaces sock_alloc_send_skb() with alloc_skb() and sets the owner under RCU to ensure safe allocation. The bug actual only if IPV6 being used and IGMPv6 (Internet Group Management Protocol for IPv6) being used too. The security impact is limited, because no known way to trigger the bug (see in the patch description: \"Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF\").",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-21759",
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},
{
"cve": "CVE-2025-21905",
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"name": "Out-of-bounds Read"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: limit printed string from FW file\n\nThere\u0027s no guarantee here that the file is always with a\nNUL-termination, so reading the string may read beyond the\nend of the TLV. If that\u0027s the last TLV in the file, it can\nperhaps even read beyond the end of the file buffer.\n\nFix that by limiting the print format to the size of the\nbuffer we have.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: wifi: iwlwifi: limit printed string from FW file",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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{
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},
{
"category": "external",
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{
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{
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid journaling sb update on error if journal is destroying\n\nPresently we always BUG_ON if trying to start a transaction on a journal marked\nwith JBD2_UNMOUNT, since this should never happen. However, while ltp running\nstress tests, it was observed that in case of some error handling paths, it is\npossible for update_super_work to start a transaction after the journal is\ndestroyed eg:\n\n(umount)\next4_kill_sb\n kill_block_super\n generic_shutdown_super\n sync_filesystem /* commits all txns */\n evict_inodes\n /* might start a new txn */\n ext4_put_super\n\tflush_work(\u0026sbi-\u003es_sb_upd_work) /* flush the workqueue */\n jbd2_journal_destroy\n journal_kill_thread\n journal-\u003ej_flags |= JBD2_UNMOUNT;\n jbd2_journal_commit_transaction\n jbd2_journal_get_descriptor_buffer\n jbd2_journal_bmap\n ext4_journal_bmap\n ext4_map_blocks\n ...\n ext4_inode_error\n ext4_handle_error\n schedule_work(\u0026sbi-\u003es_sb_upd_work)\n\n /* work queue kicks in */\n update_super_work\n jbd2_journal_start\n start_this_handle\n BUG_ON(journal-\u003ej_flags \u0026\n JBD2_UNMOUNT)\n\nHence, introduce a new mount flag to indicate journal is destroying and only do\na journaled (and deferred) update of sb if this flag is not set. Otherwise, just\nfallback to an un-journaled commit.\n\nFurther, in the journal destroy path, we have the following sequence:\n\n 1. Set mount flag indicating journal is destroying\n 2. force a commit and wait for it\n 3. flush pending sb updates\n\nThis sequence is important as it ensures that, after this point, there is no sb\nupdate that might be journaled so it is safe to update the sb outside the\njournal. (To avoid race discussed in 2d01ddc86606)\n\nAlso, we don\u0027t need a similar check in ext4_grp_locked_error since it is only\ncalled from mballoc and AFAICT it would be always valid to schedule work here.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ext4: avoid journaling sb update on error if journal is destroying",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-22113"
},
{
"category": "external",
"summary": "RHBZ#2360212",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360212"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-22113",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-22113"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-22113",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22113"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025041625-CVE-2025-22113-34cd@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025041625-CVE-2025-22113-34cd@gregkh/T"
}
],
"release_date": "2025-04-16T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-07-30T16:03:08+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"title": "kernel: ext4: avoid journaling sb update on error if journal is destroying"
},
{
"cve": "CVE-2025-37958",
"discovery_date": "2025-05-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2367572"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/huge_memory: fix dereferencing invalid pmd migration entry\n\nWhen migrating a THP, concurrent access to the PMD migration entry during\na deferred split scan can lead to an invalid address access, as\nillustrated below. To prevent this invalid access, it is necessary to\ncheck the PMD migration entry and return early. In this context, there is\nno need to use pmd_to_swp_entry and pfn_swap_entry_to_page to verify the\nequality of the target folio. Since the PMD migration entry is locked, it\ncannot be served as the target.\n\nMailing list discussion and explanation from Hugh Dickins: \"An anon_vma\nlookup points to a location which may contain the folio of interest, but\nmight instead contain another folio: and weeding out those other folios is\nprecisely what the \"folio != pmd_folio((*pmd)\" check (and the \"risk of\nreplacing the wrong folio\" comment a few lines above it) is for.\"\n\nBUG: unable to handle page fault for address: ffffea60001db008\nCPU: 0 UID: 0 PID: 2199114 Comm: tee Not tainted 6.14.0+ #4 NONE\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:split_huge_pmd_locked+0x3b5/0x2b60\nCall Trace:\n\u003cTASK\u003e\ntry_to_migrate_one+0x28c/0x3730\nrmap_walk_anon+0x4f6/0x770\nunmap_folio+0x196/0x1f0\nsplit_huge_page_to_list_to_order+0x9f6/0x1560\ndeferred_split_scan+0xac5/0x12a0\nshrinker_debugfs_scan_write+0x376/0x470\nfull_proxy_write+0x15c/0x220\nvfs_write+0x2fc/0xcb0\nksys_write+0x146/0x250\ndo_syscall_64+0x6a/0x120\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe bug is found by syzkaller on an internal kernel, then confirmed on\nupstream.",
"title": "Vulnerability description"
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},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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{
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{
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{
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{
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"text": "A use-after-free (UAF) vulnerability, which also presents a potential infinite loop condition, has been resolved in the Linux kernel. This flaw affects the HFSC (Hierarchical Fair Service Curve) queuing discipline when it is used in conjunction with NETEM (Network Emulation).\n\nA malicious user could exploit this by repeatedly inserting a class into the eltree due to insufficient validation in prior logic, effectively bypassing the protection provided by the HFSC_RSC flag. Successful exploitation could lead to memory corruption, an infinite loop, or a system crash, severely impacting network availability and system stability.",
"title": "Vulnerability description"
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{
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"text": "kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "On Red Hat Enterprise Linux 8 and later releases, regular (non-root) users can exploit this issue by abusing unprivileged user namespaces. Red Hat Enterprise Linux 6 and 7 are not affected by this CVE because they did not include the upstream commit that introduced the CVE (37d9cf1).",
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},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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{
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"text": "A vulnerability was found in the Linux kernel\u0027s management of network namespaces. By manipulating the lifecycle of network namespaces, an attacker could exploit this vulnerability to cause a system crash or leak sensitive system memory. Exploitation of this vulnerability requires that a user has access to the system and the ability to create or destroy network namespaces. This typically requires administrative privileges, but could be exposed to an unprivileged user who has control over container lifecycles or a user who has administrative privileges within a container.",
"title": "Vulnerability description"
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{
"category": "summary",
"text": "kernel: net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done",
"title": "Vulnerability summary"
},
{
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"text": "A slab-use-after-free vulnerability exists in the TIPC crypto subsystem in the Linux kernel. The bug is triggered when a network namespace is deleted while an asynchronous crypto operation is still pending, resulting in access to freed memory from a delayed worker context. The vulnerability requires local privileges to create and manipulate network namespaces and configure TIPC crypto bearers, which justifies the use of PR:L. Despite this, the impact on system memory and stability is significant due to the asynchronous nature of the cryptographic operation. Although not directly reachable from an unprivileged user context, this issue can be exploited by a local attacker with limited privileges, for example, in a container, to crash the kernel or perform arbitrary memory access via crafted namespace lifecycle manipulation.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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{
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{
"category": "external",
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{
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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