GHSA-G228-XHF6-WQQ6
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In 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().
{
"affected": [],
"aliases": [
"CVE-2026-98102"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:39Z",
"severity": null
},
"details": "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-\u003emca_sources. If the filter was previously active,\nthe code moved psf directly into pmc-\u003emca_tomb by updating psf-\u003esf_next.\n\nBecause pmc-\u003emca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf-\u003esf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc-\u003emca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc-\u003emca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu().",
"id": "GHSA-g228-xhf6-wqq6",
"modified": "2026-09-25T12:31:36Z",
"published": "2026-09-25T12:31:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98102"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"
}
],
"schema_version": "1.4.0",
"severity": []
}
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