RHSA-2026:2664
Vulnerability from csaf_redhat - Published: 2026-02-12 15:15 - Updated: 2026-03-12 19:03Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support.
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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: cifs: fix oops during encryption (CVE-2022-50341)
* kernel: RDMA/rxe: Fix incomplete state save in rxe_requester (CVE-2023-53539)
* kernel: net/mlx5e: Check for NOT_READY flag state after locking (CVE-2023-53581)
* kernel: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping (CVE-2025-40154)
* kernel: Linux kernel: Out-of-bounds write in fbdev can lead to privilege escalation, information disclosure, or denial of service. (CVE-2025-40304)
* kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (CVE-2025-40322)
* kernel: ext4: fix use-after-free in ext4_orphan_cleanup (CVE-2022-50673)
* kernel: drm/i915: Fix NULL ptr deref by checking new_crtc_state (CVE-2023-53833)
* kernel: net: atlantic: fix fragment overflow handling in RX path (CVE-2025-68301)
* kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349)
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": "Statement"
},
{
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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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"text": "A race condition was found in the Linux kernel Mellanox mlx5 network driver\u0027s traffic control offload flow management. \nA local user with privileges to configure traffic control flower filters can trigger concurrent flow deletion operations where the NOT_READY flag is checked before acquiring the necessary lock, allowing a workqueue task to concurrently remove the flow from the unready_flows list, which causes double-removal from the linked list and results in list corruption leading to denial of service via kernel crash or potentially memory corruption.",
"title": "Vulnerability description"
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"text": "kernel: net/mlx5e: Check for NOT_READY flag state after locking",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The issue arises because of incorrect lock ordering in the flow deletion path. When mlx5e_tc_del_fdb_flow() processes a flow deletion, it first checks the NOT_READY flag to determine if the flow is on the unready_flows list, then acquires the uplink_priv-\u003eunready_flows_lock mutex to remove it. However, between the flag check and lock acquisition, a workqueue task can acquire the same lock and remove the flow from the list. When the original thread then acquires the lock and attempts list removal, it performs a double-removal on an entry that is no longer in the list. This corrupts the linked list pointers, causing subsequent list operations to access freed memory containing poison values (0xdead000000000100). The race window is narrow, requiring the workqueue to execute between the flag check and lock acquisition. While this reliably causes kernel crashes when the race occurs, the underlying list corruption represents a memory safety violation that could potentially be leveraged for more sophisticated attacks with careful timing and heap 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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"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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{
"category": "general",
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-68349"
},
{
"category": "external",
"summary": "RHBZ#2424880",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2424880"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-68349",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-68349"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68349",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68349"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025122453-CVE-2025-68349-12d5@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025122453-CVE-2025-68349-12d5@gregkh/T"
}
],
"release_date": "2025-12-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-02-12T15:15:16+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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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:2664"
},
{
"category": "workaround",
"details": "If NFS service not being used, then disable it to prevent possibility of triggering this bug (and usually it is disabled by default):\nsudo systemctl stop nfs-server\nsudo systemctl disable nfs-server",
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"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"threats": [
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"details": "Moderate"
}
],
"title": "kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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