CVE-2025-39880

Advisory lineage Upstream: 0 Downstream: 44
Analyzed
Published: 23 Sept 2025, 06:00
Last modified:11 May 2026, 21:38

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Sept 2025, 06:00
Published
Vulnerability first disclosed
11 May 2026, 21:38
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-704•Incorrect Type Conversion or Cast

    The product does not correctly convert an object, resource, or structure from one type to a different type.

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < ea12ab684f8ae8a6da11a22c78d94a79e2163096 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 591ea9c30737663a471b2bb07b27ddde86b020d5 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 6bd8b56899be0b514945f639a89ccafb8f8dfaef | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < cdbc9836c7afadad68f374791738f118263c5371 | 5.11

  • linux•linux_kernel

    ≥ 5.11, < 5.15.194 | ≥ 5.16, < 6.1.153 | ≥ 6.2, < 6.6.107 | ≥ 6.7, < 6.12.48 | ≥ 6.13, < 6.16.8 | 6.17:rc1 | 6.17:rc2 | 6.17:rc3 | 6.17:rc4 | 6.17:rc5

References (7)