rhsa-2025:11299
Vulnerability from csaf_redhat
Published
2025-07-16 05:49
Modified
2025-08-20 09:06
Summary
Red Hat Security Advisory: kernel-rt security update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.
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: cifs: potential buffer overflow in handling symlinks (CVE-2022-49058)
* kernel: media: uvcvideo: Remove dangling pointers (CVE-2024-58002)
* kernel: media: uvcvideo: Fix double free in error path (CVE-2024-57980)
* kernel: x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes (CVE-2025-21991)
* kernel: net: atm: fix use after free in lec_send() (CVE-2025-22004)
* kernel: ext4: fix off-by-one error in do_split (CVE-2025-23150)
* kernel: ext4: ignore xattrs past end (CVE-2025-37738)
* kernel: misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram() (CVE-2022-49788)
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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{
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"name": "Missing Release of Memory after Effective Lifetime"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()\n\n`struct vmci_event_qp` allocated by qp_notify_peer() contains padding,\nwhich may carry uninitialized data to the userspace, as observed by\nKMSAN:\n\n BUG: KMSAN: kernel-infoleak in instrument_copy_to_user ./include/linux/instrumented.h:121\n instrument_copy_to_user ./include/linux/instrumented.h:121\n _copy_to_user+0x5f/0xb0 lib/usercopy.c:33\n copy_to_user ./include/linux/uaccess.h:169\n vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431\n vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925\n vfs_ioctl fs/ioctl.c:51\n ...\n\n Uninit was stored to memory at:\n kmemdup+0x74/0xb0 mm/util.c:131\n dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271\n vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339\n qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479\n qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662\n qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750\n vmci_qp_broker_alloc+0x96/0xd0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1940\n vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:488\n vmci_host_unlocked_ioctl+0x24fd/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:927\n ...\n\n Local variable ev created at:\n qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456\n qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662\n qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750\n\n Bytes 28-31 of 48 are uninitialized\n Memory access of size 48 starts at ffff888035155e00\n Data copied to user address 0000000020000100\n\nUse memset() to prevent the infoleaks.\n\nAlso speculatively fix qp_notify_peer_local(), which may suffer from the\nsame problem.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()",
"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-2022-49788"
},
{
"category": "external",
"summary": "RHBZ#2363378",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363378"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-49788",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-49788"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-49788",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49788"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025050121-CVE-2022-49788-6e84@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025050121-CVE-2022-49788-6e84@gregkh/T"
}
],
"release_date": "2025-05-01T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-07-16T05:49:58+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: Remove dangling pointers"
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{
"cve": "CVE-2025-21991",
"cwe": {
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"name": "Out-of-bounds Write"
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"discovery_date": "2025-04-02T00:00:00+00:00",
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes\n\nCurrently, load_microcode_amd() iterates over all NUMA nodes, retrieves their\nCPU masks and unconditionally accesses per-CPU data for the first CPU of each\nmask.\n\nAccording to Documentation/admin-guide/mm/numaperf.rst:\n\n \"Some memory may share the same node as a CPU, and others are provided as\n memory only nodes.\"\n\nTherefore, some node CPU masks may be empty and wouldn\u0027t have a \"first CPU\".\n\nOn a machine with far memory (and therefore CPU-less NUMA nodes):\n- cpumask_of_node(nid) is 0\n- cpumask_first(0) is CONFIG_NR_CPUS\n- cpu_data(CONFIG_NR_CPUS) accesses the cpu_info per-CPU array at an\n index that is 1 out of bounds\n\nThis does not have any security implications since flashing microcode is\na privileged operation but I believe this has reliability implications by\npotentially corrupting memory while flashing a microcode update.\n\nWhen booting with CONFIG_UBSAN_BOUNDS=y on an AMD machine that flashes\na microcode update. I get the following splat:\n\n UBSAN: array-index-out-of-bounds in arch/x86/kernel/cpu/microcode/amd.c:X:Y\n index 512 is out of range for type \u0027unsigned long[512]\u0027\n [...]\n Call Trace:\n dump_stack\n __ubsan_handle_out_of_bounds\n load_microcode_amd\n request_microcode_amd\n reload_store\n kernfs_fop_write_iter\n vfs_write\n ksys_write\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n\nChange the loop to go over only NUMA nodes which have CPUs before determining\nwhether the first CPU on the respective node needs microcode update.\n\n [ bp: Massage commit message, fix typo. ]",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes",
"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-2025-21991"
},
{
"category": "external",
"summary": "RHBZ#2356917",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2356917"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-21991",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21991"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-21991",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21991"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025040257-CVE-2025-21991-6aae@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025040257-CVE-2025-21991-6aae@gregkh/T"
}
],
"release_date": "2025-04-02T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-07-16T05:49:58+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: net: atm: fix use after free in lec_send()"
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{
"cve": "CVE-2025-23150",
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"id": "CWE-416",
"name": "Use After Free"
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"discovery_date": "2025-05-01T00:00:00+00:00",
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{
"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"
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-23150"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-23150",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23150"
},
{
"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": "2025-07-16T05:49:58+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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"text": "A use-after-free vulnerability has been discovered in the Linux kernel, specifically within the ext4_xattr_inode_dec_ref_all function (related to the ext4 filesystem\u0027s extended attributes). An attacker could exploit this flaw by providing a specially crafted payload, leading to a denial of service condition that compromises system availability.",
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},
{
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"text": "kernel: ext4: ignore xattrs past end",
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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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Sightings
| Author | Source | Type | Date |
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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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