CVE-2025-39880 Details
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.
A vulnerability in the Linux kernel's libceph component has been addressed, concerning improper accesses to the ceph_connection_v1_info union in the messaging protocol. The issue arises because the code reads from and writes to the v1 union member without verifying if it is active, particularly on 64-bit systems. This oversight can lead to incorrect values being processed, especially when the newer messaging protocol (msgr2) is in use. While this flaw primarily disrupts the authentication process by invalidating authorization tickets, it can also cause more severe issues under certain conditions, such as overlapping data in the connection management sequences.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/23538cfbeed87159a5ac6c61e7a6de3d8d4486a8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983 | kernel.org | Patch |
| https://git.kernel.org/stable/c/591ea9c30737663a471b2bb07b27ddde86b020d5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/6bd8b56899be0b514945f639a89ccafb8f8dfaef | kernel.org | Patch |
| https://git.kernel.org/stable/c/cdbc9836c7afadad68f374791738f118263c5371 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ea12ab684f8ae8a6da11a22c78d94a79e2163096 | kernel.org | Patch |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html | CVE | Mailing ListThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-704 | Incorrect Type Conversion or Cast | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| 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 |
CPE
Remediation
| |
| debian debian linux | 11.0 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jan 20, 2026 | Initial Analysis | [email protected] |
| Nov 3, 2025 | CVE Modified | CVE |
| Oct 2, 2025 | CVE Modified | kernel.org |
| Sep 23, 2025 | New CVE Received | kernel.org |