{"schema":"threatline.record/2","record":{"id":"CVE-2026-97939","aliases":[],"summary":"ipmr: account multicast table and route memory","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: account multicast table and route memory\n\nA netadmin in a user+net namespace can create many IPv4 and IPv6\nmulticast routing tables with MRT_TABLE and MRT6_TABLE. Each unseen\nid allocates an mr_table via the shared mr_table_alloc(), links it\ninto the per-net list, and leaves it until netns teardown. Those\nobjects were not charged to memcg, so the host unreclaimable slab\ngrows with the table count.\n\nAccount mr_table allocations with GFP_KERNEL_ACCOUNT and mark the\nIPv4/IPv6 MFC caches SLAB_ACCOUNT. This matches the established\nhandling of IP addresses, routes and alternate interface names.\n\nUnresolved MFC entries are still allocated from softIRQ with\nGFP_ATOMIC and are not charged. They expire after 10 seconds and are\nbounded by the socket receive queue; see commit 0079ad8e8dc3\n(\"ipmr: remove hard code cache_resolve_queue_len limit\").","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97939","source_modified_at":"2026-10-21T12:53:46.494Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"f0ad0860d01e47a3ffd220564c5c653b3afbe962","lessThan":"21e0749e8ef272ac7e3eefe0fa488a5983f4b038","status":"affected","versionType":"git"},{"version":"f0ad0860d01e47a3ffd220564c5c653b3afbe962","lessThan":"ec1c6140394ee87127479bc500a3158b125bf07a","status":"affected","versionType":"git"},{"version":"f0ad0860d01e47a3ffd220564c5c653b3afbe962","lessThan":"0264b3ee09b118fec8a5471b4ca288f8ab84722f","status":"affected","versionType":"git"},{"version":"f0ad0860d01e47a3ffd220564c5c653b3afbe962","lessThan":"d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c","status":"affected","versionType":"git"},{"version":"f0ad0860d01e47a3ffd220564c5c653b3afbe962","lessThan":"b7ee18725f2292ab554aa96a101ae42d45f008bd","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97939","source_modified_at":"2026-10-21T12:53:46.494Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.35","status":"affected"},{"version":"0","lessThan":"2.6.35","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97939","source_modified_at":"2026-10-21T12:53:46.494Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"21e0749e8ef272ac7e3eefe0fa488a5983f4b038","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97939","source_modified_at":"2026-10-21T12:53:46.494Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0264b3ee09b118fec8a5471b4ca288f8ab84722f","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09327,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:52.332Z","modified_at":"2026-10-21T12:53:46.494Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97939","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:53:46.494Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97939","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/21e0749e8ef272ac7e3eefe0fa488a5983f4b038"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ec1c6140394ee87127479bc500a3158b125bf07a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0264b3ee09b118fec8a5471b4ca288f8ab84722f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b7ee18725f2292ab554aa96a101ae42d45f008bd"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:53:46.494Z","content_hash":"d08902b794715444479dde64062734e28152df146b055eca6932f6479e407018"}}