VulnerabilityPublished 18 Oct 2026

CVE-2026-98642: Linux kernel · bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk

Source GCVE Database

Authoritative record:CVE-2026-98642· High

Not known to be exploited · fixed in f101602415fb39a58941bec444df65634d5a6844 : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f101602415fb39a58941bec444df65634d5a6844, a0e150a118025a05c8662c536ba2a865da86419c, 1d6581b544a88cf4348c2fb60dcb50ad63f012da +1

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.

ghsa-9437-xj9f-2c6g

What to do

Upgrade Linux kernel to f101602415fb39a58941bec444df65634d5a6844, a0e150a118025a05c8662c536ba2a865da86419c, 1d6581b544a88cf4348c2fb60dcb50ad63f012da or 1c21452d02eec2f008e2c5535820f85adbd7587a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 04fabf00b4d3aff5d010ecb617001814e409e24a, < f101602415fb39a58941bec444df65634d5a6844	Fixed in f101602415fb39a58941bec444df65634d5a6844
LinuxLinux	Affected ≥ 04fabf00b4d3aff5d010ecb617001814e409e24a, < a0e150a118025a05c8662c536ba2a865da86419c	Fixed in a0e150a118025a05c8662c536ba2a865da86419c
LinuxLinux	Affected ≥ 04fabf00b4d3aff5d010ecb617001814e409e24a, < 1d6581b544a88cf4348c2fb60dcb50ad63f012da	Fixed in 1d6581b544a88cf4348c2fb60dcb50ad63f012da
LinuxLinux	Affected ≥ 04fabf00b4d3aff5d010ecb617001814e409e24a, < 1c21452d02eec2f008e2c5535820f85adbd7587a	Fixed in 1c21452d02eec2f008e2c5535820f85adbd7587a
LinuxLinux	Affected =6.6	Fixed in–

AI-suggested

A fix is available that introduces a raw spinlock to synchronize concurrent access to the affected ttrace lists in the BPF memory allocator. Users should apply the official Linux kernel updates that include this patch to remediate the vulnerability. No alternative mitigations are indicated.

Description

A use-after-free (UAF) vulnerability in the Linux kernel's BPF memory allocator was fixed. The flaw arises from a race condition due to concurrent access to ttrace lists without proper synchronization, leading to potential memory corruption. The issue was identified by repeated triggering of UAF errors by Syzkaller. The fix introduces a raw spinlock to synchronize concurrent consumption of specific linked lists used in BPF memory allocation.

References

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