Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2025-71085

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
13/01/2026
Last modified:
25/03/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()<br /> <br /> There exists a kernel oops caused by a BUG_ON(nhead INT_MAX<br /> (i.e. (int)(skb_headroom(skb) + len_delta) skb_headroom(skb)) is meant to ensure<br /> that delta = headroom - skb_headroom(skb) is never negative, otherwise<br /> we will trigger a BUG_ON in pskb_expand_head(). However, if<br /> headroom &gt; INT_MAX and delta cmsg_len = cmsg_len;<br /> cmsg-&gt;cmsg_level = IPPROTO_IPV6;<br /> cmsg-&gt;cmsg_type = IPV6_HOPOPTS;<br /> char * hop_hdr = (char *)cmsg + sizeof(struct cmsghdr);<br /> hop_hdr[1] = 0x9; //set hop size - (0x9 + 1) * 8 = 80<br /> <br /> sendmsg(fd, &amp;msg, 0);

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 4.8.1 (including) 5.10.248 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.198 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.160 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.120 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.64 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.4 (excluding)
cpe:2.3:o:linux:linux_kernel:4.8:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools