io_uring/net: don't overconsume buffers when using MSG_TRUNC (CVE-2026-97618) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97618

io_uring/net: don't overconsume buffers when using MSG_TRUNC

Answer in brief

CVE-2026-97618 records a Unknown severity vulnerability in io_uring/net: don't overconsume buffers when using MSG_TRUNC. 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 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	>=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <927d96f91c582b319d104ecf50ec935a8dc29193 \|\| >=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <2e70ea75c7bb38a6dc212975f887310f14f7c043 \|\| >=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <6028b543884f8735e057ec9eea4908cd61cab230	927d96f91c582b319d104ecf50ec935a8dc29193, 2e70ea75c7bb38a6dc212975f887310f14f7c043, 6028b543884f8735e057ec9eea4908cd61cab230
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 927d96f91c582b319d104ecf50ec935a8dc29193 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: io_uring/net: don't overconsume buffers when using MSG_TRUNC When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is larger than the provided buffer, the net layer returns the full length of the packet rather than the number of bytes actually copied into the buffer. As a result, io_uring advances more of the provided buffer ring than was actually filled. Use the actual filled region size to consume the buffer, but still return the full size to preserve MSG_TRUNC semantics. Take care with multishot, because that seems to already truncate the consumption based on the available payload size. This was reported in https://github.com/axboe/liburing/issues/1619. [axboe: fold in size_t unsigned fix]

Quoted source text, attributed separately from HOL analysis.