SB2025022736 - Memory leak in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2025-21757)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the seg6_input_core() and seg6_output_core() functions in net/ipv6/seg6_iptunnel.c, within the rpl_output() and rpl_input() functions in net/ipv6/rpl_iptunnel.c, within the ioam6_do_encap(), ip6_route_output() and dst_output() functions in net/ipv6/ioam6_iptunnel.c. A local user can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2248b8145053eb2ae35ca4cf694b885a086719bb
• https://git.kernel.org/stable/c/c71a192976ded2f2f416d03c4f595cdd4478b825
• https://git.kernel.org/stable/c/d90f8f930c3053bb11f5def9aff5310a70429260
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.4