binder: fix leaked fd fixups on TF_UPDATE_TXN supersede
In 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supersede When a TF_UPDATE_TXN transaction supersedes a pending async transaction in a frozen process, the outdated transaction is freed with kfree() directly.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.
CVE-2026-98777
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98777
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9864bb4801331daa48514face9d0f4861e4d485b",
"lessThan": "a7329ea53d04f0c6135d02905810cd6f42acdf45",
"versionType": "git"
},
{
"status": "affected",
"version": "9864bb4801331daa48514face9d0f4861e4d485b",
"lessThan": "7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55",
"versionType": "git"
},
{
"status": "affected",
"version": "9864bb4801331daa48514face9d0f4861e4d485b",
"lessThan": "1299cb3fb061598496086fc87ff291057831148e",
"versionType": "git"
},
{
"status": "affected",
"version": "9864bb4801331daa48514face9d0f4861e4d485b",
"lessThan": "6673f4f21e2fddfed0abe1eb9045cc958e6db130",
"versionType": "git"
},
{
"status": "affected",
"version": "9864bb4801331daa48514face9d0f4861e4d485b",
"lessThan": "c4c02084d6687d5cd5edccaf52cc45e5160f1184",
"versionType": "git"
}
],
"programFiles": [
"drivers/android/binder.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/android/binder.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98777
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48970 · Revision 1
- Added to Heist Feed
- Publisher date