rhsa-2025:12525
Vulnerability from csaf_redhat
Published
2025-08-04 15:19
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 9.0 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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: 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: ext4: fix off-by-one error in do_split (CVE-2025-23150)
* kernel: mm/huge_memory: fix dereferencing invalid pmd migration entry (CVE-2025-37958)
* kernel: writeback: avoid use-after-free after removing device (CVE-2022-49995)
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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"title": "Vulnerability description"
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"text": "kernel: writeback: avoid use-after-free after removing device",
"title": "Vulnerability summary"
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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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{
"cve": "CVE-2025-22113",
"cwe": {
"id": "CWE-99",
"name": "Improper Control of Resource Identifiers (\u0027Resource Injection\u0027)"
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{
"category": "description",
"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"
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"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"
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},
{
"category": "external",
"summary": "RHBZ#2360212",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360212"
},
{
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"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",
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{
"category": "vendor_fix",
"date": "2025-08-04T15:19:38+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: ext4: avoid journaling sb update on error if journal is destroying"
},
{
"cve": "CVE-2025-23150",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-05-01T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2363268"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix off-by-one error in do_split\n\nSyzkaller detected a use-after-free issue in ext4_insert_dentry that was\ncaused by out-of-bounds access due to incorrect splitting in do_split.\n\nBUG: KASAN: use-after-free in ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109\nWrite of size 251 at addr ffff888074572f14 by task syz-executor335/5847\n\nCPU: 0 UID: 0 PID: 5847 Comm: syz-executor335 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n kasan_check_range+0x282/0x290 mm/kasan/generic.c:189\n __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106\n ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109\n add_dirent_to_buf+0x3d9/0x750 fs/ext4/namei.c:2154\n make_indexed_dir+0xf98/0x1600 fs/ext4/namei.c:2351\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2455\n ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2796\n ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3431\n vfs_symlink+0x137/0x2e0 fs/namei.c:4615\n do_symlinkat+0x222/0x3a0 fs/namei.c:4641\n __do_sys_symlink fs/namei.c:4662 [inline]\n __se_sys_symlink fs/namei.c:4660 [inline]\n __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThe following loop is located right above \u0027if\u0027 statement.\n\nfor (i = count-1; i \u003e= 0; i--) {\n\t/* is more than half of this entry in 2nd half of the block? */\n\tif (size + map[i].size/2 \u003e blocksize/2)\n\t\tbreak;\n\tsize += map[i].size;\n\tmove++;\n}\n\n\u0027i\u0027 in this case could go down to -1, in which case sum of active entries\nwouldn\u0027t exceed half the block size, but previous behaviour would also do\nsplit in half if sum would exceed at the very last block, which in case of\nhaving too many long name files in a single block could lead to\nout-of-bounds access and following use-after-free.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ext4: fix off-by-one error in do_split",
"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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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-23150"
},
{
"category": "external",
"summary": "RHBZ#2363268",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363268"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-23150",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-23150"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-23150",
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},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025050127-CVE-2025-23150-15b8@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025050127-CVE-2025-23150-15b8@gregkh/T"
}
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"release_date": "2025-05-01T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-08-04T15:19:38+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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{
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{
"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"
},
{
"category": "summary",
"text": "kernel: mm/huge_memory: fix dereferencing invalid pmd migration entry",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Local DoS via page fault in THP migration edge case. Requires aggressive memory operations and THP. No remote or privilege escalation risk.",
"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-2025-37958"
},
{
"category": "external",
"summary": "RHBZ#2367572",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367572"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-37958",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-37958"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-37958",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37958"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025052003-CVE-2025-37958-02de@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025052003-CVE-2025-37958-02de@gregkh/T"
}
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"release_date": "2025-05-20T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-08-04T15:19:38+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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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: mm/huge_memory: fix dereferencing invalid pmd migration entry"
}
]
}
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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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