libceph: fix invalid accesses to ceph_connection_v1_info (CVE-2025-39880) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2025-39880

libceph: fix invalid accesses to ceph_connection_v1_info

Answer in brief

CVE-2025-39880 records a Unknown severity vulnerability in libceph: fix invalid accesses to ceph_connection_v1_info. 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 23, 2025Updated Aug 5, 2026Source checked Sep 21, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 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	>=cd1a677cad994021b19665ed476aea63f5d54f31 <ea12ab684f8ae8a6da11a22c78d94a79e2163096 \|\| >=cd1a677cad994021b19665ed476aea63f5d54f31 <591ea9c30737663a471b2bb07b27ddde86b020d5 \|\| >=cd1a677cad994021b19665ed476aea63f5d54f31 <23538cfbeed87159a5ac6c61e7a6de3d8d4486a8 \|\| >=cd1a677cad994021b19665ed476aea63f5d54f31 <35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983 \|\| >=cd1a677cad994021b19665ed476aea63f5d54f31 <6bd8b56899be0b514945f639a89ccafb8f8dfaef \|\| >=cd1a677cad994021b19665ed476aea63f5d54f31 <cdbc9836c7afadad68f374791738f118263c5371	ea12ab684f8ae8a6da11a22c78d94a79e2163096, 591ea9c30737663a471b2bb07b27ddde86b020d5, 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8, 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983, 6bd8b56899be0b514945f639a89ccafb8f8dfaef, cdbc9836c7afadad68f374791738f118263c5371
Linux/Linuxgeneric	5.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ea12ab684f8ae8a6da11a22c78d94a79e2163096 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 23, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: libceph: fix invalid accesses to ceph_connection_v1_info There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use). On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and successive fetching of new tickets. con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.

Quoted source text, attributed separately from HOL analysis.