cifs: Fix server use-after-free in cifs_chan_skip_or_disable()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98261
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:15 UTC
Updated2026-10-19 10:18:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: Fix server use-after-free in cifs_chan_skip_or_disable() When a secondary channel is no longer supported by the server, cifs_chan_skip_or_disable() drops the channel reference with cifs_put_tcp_session() and then continues to use the server pointer by calling cifs_signal_cifsd_for_reconnect() on it and reading its primary_server pointer. cifs_put_tcp_session() can drop the last reference of the channel and tear it down, so both the channel and the primary server (whose reference is also dropped by cifs_put_tcp_session()) can be freed before they are signaled for reconnect. Signal the channel and the primary server and capture the primary server pointer before dropping the channel reference with cifs_put_tcp_session().

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001750000 probability, percentile 0.063810000 (date 2026-10-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 50e8363ecc85da49764781da90ebffe1a657b370 0338489960ddad6368bce55e8adbc176c523093d git Not specified
CNA Linux Linux affected f591062bdbf4742b7f1622173017f19e927057b0 edd52eae5fcfb8433b6bb0e7cd98db438fe01227 git Not specified
CNA Linux Linux affected f591062bdbf4742b7f1622173017f19e927057b0 fcc0a935bb6e37ecbf7e4335061309f896f35780 git Not specified
CNA Linux Linux affected f591062bdbf4742b7f1622173017f19e927057b0 7a1b27780b113583a94256d58dabfe7c0d9286e7 git Not specified
CNA Linux Linux affected f591062bdbf4742b7f1622173017f19e927057b0 717e0a25036b6c92cecace30913b2d874a4c22b8 git Not specified
CNA Linux Linux affected d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4 git Not specified
CNA Linux Linux affected 6.6.15 6.6.158 semver Not specified
CNA Linux Linux affected 6.7.3 6.8 semver Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0338489960ddad6368bce55e8adbc176c523093d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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