printk: Fix possible console use-after-free

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93134
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:08 UTC
Updated2026-09-17 17:18:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: printk: Fix possible console use-after-free When emitting a record via legacy printing, it is possible that a handover to another legacy printing context occurs. When a context has performed a handover, the console SRCU read lock is released and the pointer to the console struct might now be invalid. Therefore, after calling nbcon_legacy_emit_next_record() or console_emit_next_record(), it is necessary to check if a handover occurred _before_ further @con usage. Sashiko pointed out that console_flush_one_record() was not doing this. In console_flush_one_record(), after emitting a record, move the further usage of @con after the handover check.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101610000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c158834b223fbfab3a14855ac203b8d9cddbbefd f0104a7b730de32eefb3d4a27279592b5504ad59 git Not specified
CNA Linux Linux affected c158834b223fbfab3a14855ac203b8d9cddbbefd fbf9bb81b21537ede387a31cc586f1d2ce66a74e git Not specified
CNA Linux Linux affected c158834b223fbfab3a14855ac203b8d9cddbbefd 8f194dee0c0d1223255bae1429e1939882f540fc git Not specified
CNA Linux Linux affected c158834b223fbfab3a14855ac203b8d9cddbbefd 36630cafbeede0b64c370edb2f7b4094327ee1e0 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 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/8f194dee0c0d1223255bae1429e1939882f540fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0104a7b730de32eefb3d4a27279592b5504ad59 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fbf9bb81b21537ede387a31cc586f1d2ce66a74e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36630cafbeede0b64c370edb2f7b4094327ee1e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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