tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98754
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:29 UTC
Updated2026-10-26 07:17:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup vcc_cleanup() sets port->tty to NULL without holding port->lock, racing with vcc_event() LDC callbacks that read port->tty under port->lock and then use tty->port. This can cause a use-after-free when the callback dereferences tty->port after cleanup has already destroyed and freed it.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.057430000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb 57753441ef84bee3bf0e9ee1e3778d119c44aa32 git Not specified
CNA Linux Linux affected 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb 88f6ecb058801e9ce7b9aabc966530118d7cd53c git Not specified
CNA Linux Linux affected 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb 821050631750e982007c0856c119346edba51cae git Not specified
CNA Linux Linux affected 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb 1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4 git Not specified
CNA Linux Linux affected 8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb 03b49c991abb8d021ca6fe51cd173447236b0552 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/03b49c991abb8d021ca6fe51cd173447236b0552 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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