CVE-2026-98102

CVE CVE-2026-98102EUVD EUVD-2026-86933Published 2026-09-25T10:35:53.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.13; patch: 7.3-rc2; 4b200e398953c237c86d32bf26d4cb2a96556a6f <93b49239840b91313adbd77b8b52993eff2d08c1; patch: 6.18.53; patch: 6.12.111; patch: 0; 4b200e398953c237c86d32bf26d4cb2a96556a6f <8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4; 4b200e398953c237c86d32bf26d4cb2a96556a6f <4352737297b262e8367675c19a7dc6a9f53c97af; 5.10.261 <5.11; 86c49119f0353f857cc08030ec9e4ebaab3d5a64; 4b200e398953c237c86d32bf26d4cb2a96556a6f <5149c60c406595b56fda0c6e9aae7fd287f636aa; patch: 7.2.7

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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