CVE-2025-39880

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-39880
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39880.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39880
Downstream
Related
Published
2025-09-23T06:00:49.897Z
Modified
2026-03-20T12:43:05.602105Z
Summary
libceph: fix invalid accesses to ceph_connection_v1_info
Details

In the Linux kernel, the following vulnerability has been resolved:

libceph: fix invalid accesses to cephconnectionv1_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.authretry overlaps with con->v2.outiter, 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.connectseq overlaps with con->v2.connbufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39880.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
cd1a677cad994021b19665ed476aea63f5d54f31
Fixed
ea12ab684f8ae8a6da11a22c78d94a79e2163096
Fixed
591ea9c30737663a471b2bb07b27ddde86b020d5
Fixed
23538cfbeed87159a5ac6c61e7a6de3d8d4486a8
Fixed
35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983
Fixed
6bd8b56899be0b514945f639a89ccafb8f8dfaef
Fixed
cdbc9836c7afadad68f374791738f118263c5371

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39880.json"