cxl/mbox: Break poison list loop on an empty payload

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Summary

CVECVE-2026-93097
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:03 UTC
Updated2026-09-17 17:18:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Break poison list loop on an empty payload A device that returns count == 0 with CXL_POISON_FLAG_MORE set on every iteration never advances nr_records, so the max_errors guard never trips and the do/while loops forever while holding poison.mutex. That hangs the sysfs-triggered scan thread and blocks all subsequent poison operations on the device. The existing "Protect against an uncleared _FLAG_MORE" guard was intended to bound a misbehaving device but does not cover the count == 0 case. Stop the loop on an empty payload so a malfunctioning or malicious device cannot wedge the poison scan.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ed83f7ca398b3798b82c1d5d1113011c0e5a2198 86771c105293ca26bfcc320b4f60d32c137b54aa git Not specified
CNA Linux Linux affected ed83f7ca398b3798b82c1d5d1113011c0e5a2198 42eab80981f4d2ac820e253e80ecf92f8cd91f69 git Not specified
CNA Linux Linux affected ed83f7ca398b3798b82c1d5d1113011c0e5a2198 6ad491cef1a812cf7b53aa769cd8869516c47362 git Not specified
CNA Linux Linux affected ed83f7ca398b3798b82c1d5d1113011c0e5a2198 e77594e0cea67ab1c2317a27aa77a744e26ad6a6 git Not specified
CNA Linux Linux affected ed83f7ca398b3798b82c1d5d1113011c0e5a2198 8b301c4afbce4bc3f94528441d8d5ce1366504ad git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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