bpf: Reject arena frees below the arena base

Answer in brief

CVE-2026-93045 records a Unknown severity vulnerability in bpf: Reject arena frees below the arena base. 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	>=317460317a02a1af512697e6e964298dedd8a163 <90453eaf8f14e7be0ab03983f2a93aeb6b990a58 \|\| >=317460317a02a1af512697e6e964298dedd8a163 <a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20 \|\| >=317460317a02a1af512697e6e964298dedd8a163 <8a08635656037aee9c12231ed384449c4ffb1a93 \|\| >=317460317a02a1af512697e6e964298dedd8a163 <b5a71cb2db6d84ac0042549dcec266b18429d41e	90453eaf8f14e7be0ab03983f2a93aeb6b990a58, a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20, 8a08635656037aee9c12231ed384449c4ffb1a93, b5a71cb2db6d84ac0042549dcec266b18429d41e
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 90453eaf8f14e7be0ab03983f2a93aeb6b990a58 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: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.

Quoted source text, attributed separately from HOL analysis.