VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-90300: Linux kernel · bpf: Clear buf on error in __bpf_get_task_stack

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f523359c4789bb0396d2d642464a6e2fd4f2299d : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:42 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f523359c4789bb0396d2d642464a6e2fd4f2299d, f5d242825ca417bb6afe35fde6e8880f97ca43fb, 6f5a7bcc049709af12e403111d5e73e80910dafc +4

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 >=5.10.30 <5.11 >=5.11.14 <5.12 >=5.10.96 <5.11	Fixed in f523359c4789bb0396d2d642464a6e2fd4f2299d f5d242825ca417bb6afe35fde6e8880f97ca43fb 6f5a7bcc049709af12e403111d5e73e80910dafc 5.12 5.11 4acc761b4e3feca1eb648d21fc4d665b23c5372d 1f0f61573ba4cb899105b5cef65be3ca02205f93
LinuxLinux	Affected =5.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Clear buf on error in __bpf_get_task_stack Both bpf_get_task_stack and bpf_get_task_stack_sleepable helpers that use __bpf_get_task_stack have buf defined as ARG_PTR_TO_UNINIT_MEM argument and we should initialize the buf on every return path. Adding missing buf memset for __bpf_get_task_stack fail paths. This provides deterministic buffer contents, which is useful when the buffer is used directly as a map key.

References

Community reviews

Loading reviews…