What’s Vulnerable › Vulnerabilities

CVE-2025-38550: ipv6: mcast: Delay put pmc->idev in mld_del_delrec()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-16 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: Delay put pmc->idev in mld_del_delrec() pmc->idev is still used in ip6_mc_clear_src(), so as mld_clear_delrec() does, the reference should be put after ip6_mc_clear_src() return.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.13 before 5.15.190; from 5.16 before 6.1.147; from 6.2 before 6.6.100; from 6.7 before 6.12.40; from 6.13 before 6.15.8; 6.16-rc1, 6.16-rc2, 6.16-rc3, 6.16-rc4, 6.16-rc5, 6.16-rc6 — fixed in 5.15.190, 6.1.147, 6.12.40, 6.15.8, 6.6.100

How to fix

Upgrade to a fixed version: Linux kernel 5.15.190, 6.1.147, 6.12.40, 6.15.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1b5b413094af8d88a31b5df3fd262f6baca53841
• https://git.kernel.org/stable/c/5f18e0130194550dff734e155029ae734378b5ea
• https://git.kernel.org/stable/c/6e4eec86fe5f6b3fdbc702d1d36ac2a6e7ec0806
• https://git.kernel.org/stable/c/728db00a14cacb37f36e9382ab5fad55caf890cc
• https://git.kernel.org/stable/c/7929d27c747eafe8fca3eecd74a334503ee4c839
• https://git.kernel.org/stable/c/ae3264a25a4635531264728859dbe9c659fad554
• https://git.kernel.org/stable/c/dcbc346f50a009d8b7f4e330f9f2e22d6442fa26
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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