Unknown severity · Source severity not reportedCVE-2026-23259

io_uring/rw: free potentially allocated iovec on cache put failureCVE-2026-23259

Answer in brief

CVE-2026-23259 records a Unknown severity vulnerability in io_uring/rw: free potentially allocated iovec on cache put 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 Mar 18, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 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	>=a9165b83c1937eeed1f0c731468216d6371d647f <41cda4c66846c3bfcdeaf28444ccabbb55e64cf1 \|\| >=a9165b83c1937eeed1f0c731468216d6371d647f <1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c \|\| >=a9165b83c1937eeed1f0c731468216d6371d647f <4b9748055457ac3a0710bf210c229d01ea1b01b9	41cda4c66846c3bfcdeaf28444ccabbb55e64cf1, 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c, 4b9748055457ac3a0710bf210c229d01ea1b01b9
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Mar 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 21, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: free potentially allocated iovec on cache put failure If a read/write request goes through io_req_rw_cleanup() and has an allocated iovec attached and fails to put to the rw_cache, then it may end up with an unaccounted iovec pointer. Have io_rw_recycle() return whether it recycled the request or not, and use that to gauge whether to free a potential iovec or not.

Quoted source text, attributed separately from HOL analysis.