smb: client: split cached_fid bitfields to avoid shared-byte RMW races

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-23230
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-18 16:22:32 UTC
Updated2026-04-02 15:16:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: split cached_fid bitfields to avoid shared-byte RMW races is_open, has_lease and on_list are stored in the same bitfield byte in struct cached_fid but are updated in different code paths that may run concurrently. Bitfield assignments generate byte read–modify–write operations (e.g. `orb $mask, addr` on x86_64), so updating one flag can restore stale values of the others. A possible interleaving is: CPU1: load old byte (has_lease=1, on_list=1) CPU2: clear both flags (store 0) CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits To avoid this class of races, convert these flags to separate bool fields.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 569fecc56bfe4df66f05734d67daef887746656b git Not specified
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 4386f6af8aaedd0c5ad6f659b40cadcc8f423828 git Not specified
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a git Not specified
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 c4b9edd55987384a1f201d3d07ff71e448d79c1b git Not specified
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 4cfa4c37dcbcfd70866e856200ed8a2894cac578 git Not specified
CNA Linux Linux affected ebe98f1447bbccf8228335c62d86af02a0ed23f7 ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.164 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.125 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.72 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.11 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.1 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

CVE.report and Source URL Uptime Status status.cve.report