bpf: Clear buf on error in __bpf_get_task_stack

Answer in brief

CVE-2026-90300 records a Unknown severity vulnerability in bpf: Clear buf on error in __bpf_get_task_stack. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=06ab134ce8ecfa5a69e850f88f81c8a4c3fa91df <f523359c4789bb0396d2d642464a6e2fd4f2299d \|\| >=06ab134ce8ecfa5a69e850f88f81c8a4c3fa91df <f5d242825ca417bb6afe35fde6e8880f97ca43fb \|\| d921baabd96445ef9c9c9410ca06164359c8a1a5 \|\| 9c020a533eaae1c2d41a7e3835c4c818a9b4b656 \|\| ff6bdc205fd0a83bd365405d4e31fb5905826996 \|\| >=5.10.30 <5.11 \|\| >=5.11.14 <5.12 \|\| >=5.10.96 <5.11	f523359c4789bb0396d2d642464a6e2fd4f2299d, f5d242825ca417bb6afe35fde6e8880f97ca43fb, 5.11, 5.12
Linux/Linuxgeneric	5.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to f523359c4789bb0396d2d642464a6e2fd4f2299d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.