VulnerabilityPublished 18 Oct 2026

CVE-2026-98813: Linux kernel · bpf: Hold map BTF for the memory allocator destructor record

Source GCVE Database

Authoritative record:CVE-2026-98813· High

Not known to be exploited · fixed in b506f5699e145196ee29d76cf1ca1cbb2202c055 : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b506f5699e145196ee29d76cf1ca1cbb2202c055, ab39974240a0cff765f3bb9cce81d8001ffdb144, 6.19 +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-8234-qcrx-h2v8

What to do

Upgrade Linux kernel to b506f5699e145196ee29d76cf1ca1cbb2202c055, ab39974240a0cff765f3bb9cce81d8001ffdb144, 6.19 or 6.13.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.12.112 <6.13 >=6.18.55 <6.19	Fixed in b506f5699e145196ee29d76cf1ca1cbb2202c055 ab39974240a0cff765f3bb9cce81d8001ffdb144 6.19 6.13
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to hold a reference on the map BTF during the destructor context to prevent use-after-free conditions. Users should update to the fixed kernel version once available. No additional mitigation is indicated.

Description

A use-after-free vulnerability in the Linux kernel's BPF subsystem was resolved by ensuring a reference to the map BTF is held during memory allocator destructor operations. The flaw involved premature freeing of BTF data while deferred workqueue tasks still accessed it, leading to kernel memory corruption detected by KASAN.

References

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