bpf, cgroup: Fix storage null-ptr-deref after replacing prog (CVE-2026-90250) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90250

bpf, cgroup: Fix storage null-ptr-deref after replacing prog

Answer in brief

CVE-2026-90250 records a Unknown severity vulnerability in bpf, cgroup: Fix storage null-ptr-deref after replacing prog. 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	>=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <a033c950f6731be88a7da98604ed78f302f15b80 \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <1ab3da12061d7ccb099f7e925fa2d865967a316a \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <12feca126831556dc7fabe5a3ba28fbd328768b6 \|\| >=0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94	a033c950f6731be88a7da98604ed78f302f15b80, 1ab3da12061d7ccb099f7e925fa2d865967a316a, 12feca126831556dc7fabe5a3ba28fbd328768b6, 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94
Linux/Linuxgeneric	5.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a033c950f6731be88a7da98604ed78f302f15b80 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, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B. The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.

Quoted source text, attributed separately from HOL analysis.