binder: fix leaked fd fixups on TF_UPDATE_TXN supersede

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98777
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:31 UTC
Updated2026-10-21 13:21:45 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: binder: fix leaked fd fixups on TF_UPDATE_TXN supersede When a TF_UPDATE_TXN transaction supersedes a pending async transaction in a frozen process, the outdated transaction is freed with kfree() directly. This skips binder_free_txn_fixups(), leaking all binder_txn_fd_fixup entries and their fget()'d struct file references. The leaked file refcounts never reach zero, so the struct file objects are permanently pinned in memory. They survive process exit and accumulate across invocations until file-max exhaustion. Every other transaction cleanup path (binder_free_transaction(), binder_transaction() error paths, binder_release_work()) correctly calls binder_free_txn_fixups(). Add the missing call before kfree() in the t_outdated cleanup block.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.057210000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9864bb4801331daa48514face9d0f4861e4d485b a7329ea53d04f0c6135d02905810cd6f42acdf45 git Not specified
CNA Linux Linux affected 9864bb4801331daa48514face9d0f4861e4d485b 7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55 git Not specified
CNA Linux Linux affected 9864bb4801331daa48514face9d0f4861e4d485b 1299cb3fb061598496086fc87ff291057831148e git Not specified
CNA Linux Linux affected 9864bb4801331daa48514face9d0f4861e4d485b 6673f4f21e2fddfed0abe1eb9045cc958e6db130 git Not specified
CNA Linux Linux affected 9864bb4801331daa48514face9d0f4861e4d485b c4c02084d6687d5cd5edccaf52cc45e5160f1184 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 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/a7329ea53d04f0c6135d02905810cd6f42acdf45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6673f4f21e2fddfed0abe1eb9045cc958e6db130 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4c02084d6687d5cd5edccaf52cc45e5160f1184 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1299cb3fb061598496086fc87ff291057831148e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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