bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure (CVE-2026-90210) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90210

bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

Answer in brief

CVE-2026-90210 records a Unknown severity vulnerability in bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure. 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	>=aef4dfa790b22d8052cfb78044eadbe03c876c39 <65c3939656fd7848e9274faa07c26748b5bf049c \|\| >=aef4dfa790b22d8052cfb78044eadbe03c876c39 <0253073fb7d79a2dd2eae9581ea16db2aef395a6	65c3939656fd7848e9274faa07c26748b5bf049c, 0253073fb7d79a2dd2eae9581ea16db2aef395a6
Linux/Linuxgeneric	7.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 65c3939656fd7848e9274faa07c26748b5bf049c 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: Fix UAF in bpf_trampoline_multi_attach_free on update failure When bpf_trampoline_update() fails before modify_fentry_multi()/ unregister_fentry_multi() is called, cur_image is unchanged (cur_image == old_image) and ftrace still calls into it. Freeing old_image in that case causes a UAF. Only free old_image when it differs from cur_image.

Quoted source text, attributed separately from HOL analysis.