CVE-2026-98102ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4b200e398953c237c86d32bf26d4cb2a96556a6f before c3343cd7ec8706c221e52b782f386b9af14a928a; from 4b200e398953c237c86d32bf26d4cb2a96556a6f before 4352737297b262e8367675c19a7dc6a9f53c97af; from 4b200e398953c237c86d32bf26d4cb2a96556a6f before 8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4; from 4b200e398953c237c86d32bf26d4cb2a96556a6f before 5149c60c406595b56fda0c6e9aae7fd287f636aa; from 4b200e398953c237c86d32bf26d4cb2a96556a6f before 93b49239840b91313adbd77b8b52993eff2d08c1; 86c49119f0353f857cc08030ec9e4ebaab3d5a64; from 5.10.261 before 5.11 | CNA record |
References
- https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a
- https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af
- https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4
- https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa
- https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.