ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98102
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:39 UTC
Updated2026-09-25 11:17:39 UTC
DescriptionIn 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().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 4352737297b262e8367675c19a7dc6a9f53c97af git Not specified
CNA Linux Linux affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4 git Not specified
CNA Linux Linux affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 5149c60c406595b56fda0c6e9aae7fd287f636aa git Not specified
CNA Linux Linux affected 4b200e398953c237c86d32bf26d4cb2a96556a6f 93b49239840b91313adbd77b8b52993eff2d08c1 git Not specified
CNA Linux Linux affected 86c49119f0353f857cc08030ec9e4ebaab3d5a64 git Not specified
CNA Linux Linux affected 5.10.261 5.11 semver Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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