PT-2026-2606 · Linux+3 · Linux Kernel+3
Published
2026-01-13
·
Updated
2026-05-26
·
CVE-2025-71085
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw within the IPv6 implementation, specifically in the
pskb expand head() function as part of calipso skbuff setattr(). This issue can lead to a kernel oops triggered by a BUG ON(nhead < 0) condition in net/core/skbuff.c:2232. The root cause is an implicit integer cast in skb cow(), where a negative value for headroom can be passed to pskb expand head(). The issue is triggered when using the netlabelctl tool to map and add calipso settings, followed by sending a UDP packet with a specific hop header configuration. The vulnerable function is pskb expand head(). The vulnerable parameter is nhead.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Assertion Failure
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Linuxmint
Linux Kernel
Rocky Linux
Ubuntu