{"id":"CVE-2026-98102","published":"2026-09-25T11:17:39.943","lastModified":"2026-09-25T11:17:39.943","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu().","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af","tags":[]},{"url":"https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa","tags":[]},{"url":"https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4","tags":[]},{"url":"https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}