VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98777: Linux kernel · binder: fix leaked fd fixups on TF_UPDATE_TXN supersede

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c4c02084d6687d5cd5edccaf52cc45e5160f1184 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c4c02084d6687d5cd5edccaf52cc45e5160f1184, a7329ea53d04f0c6135d02905810cd6f42acdf45, 6673f4f21e2fddfed0abe1eb9045cc958e6db130 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9864bb4801331daa48514face9d0f4861e4d485b, < c4c02084d6687d5cd5edccaf52cc45e5160f1184	Fixed in c4c02084d6687d5cd5edccaf52cc45e5160f1184
LinuxLinux	Affected ≥ 9864bb4801331daa48514face9d0f4861e4d485b, < a7329ea53d04f0c6135d02905810cd6f42acdf45	Fixed in a7329ea53d04f0c6135d02905810cd6f42acdf45
LinuxLinux	Affected ≥ 9864bb4801331daa48514face9d0f4861e4d485b, < 6673f4f21e2fddfed0abe1eb9045cc958e6db130	Fixed in 6673f4f21e2fddfed0abe1eb9045cc958e6db130
LinuxLinux	Affected ≥ 9864bb4801331daa48514face9d0f4861e4d485b, < 1299cb3fb061598496086fc87ff291057831148e	Fixed in 1299cb3fb061598496086fc87ff291057831148e
LinuxLinux	Affected ≥ 9864bb4801331daa48514face9d0f4861e4d485b, < 7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55	Fixed in 7fd609fb0e9dcbc4d7a1e4da1af5368c0555ff55
LinuxLinux	Affected =6.0	Fixed in–

Description

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.

References

Community reviews

Loading reviews…