{"id":"CVE-2026-93226","revision":"91a7a24440744fc58daf874e773b475f","records":[{"revision":"91a7a24440744fc58daf874e773b475f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93226","aliases":[],"title":"ipv6: use RCU iterator to dump route exceptions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: use RCU iterator to dump route exceptions\n\nrt6_nh_dump_exceptions() uses hlist_for_each_entry() to iterate over\nRCU-protected exception lists. The caller holds rcu_read_lock(), but does\nnot hold rt6_exception_lock, so rt6_insert_exception() can concurrently\nadd an entry with hlist_add_head_rcu().\n\nKCSAN reports this race (irrelevant details omitted):\n\n  ==================================================================\n  BUG: KCSAN: data-race in rt6_insert_exception / rt6_nh_dump_exceptions\n\n  write (marked) to 0xffff8a7c44c59620 of 8 bytes by interrupt on cpu 5:\n    rt6_insert_exception+0x3bb/0x760\n    __ip6_rt_update_pmtu+0x4fe/0x750\n    ip6_sk_update_pmtu+0x19a/0x3b0\n    udpv6_err+0x3ff/0x800\n    icmpv6_notify+0x1e1/0x440\n    icmpv6_rcv+0x8c0/0xab0\n    ip6_protocol_deliver_rcu+0x616/0x840\n    ip6_input_finish+0xb9/0x160\n    ...\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n  read to 0xffff8a7c44c59620 of 8 bytes by task 549 on cpu 14:\n    rt6_nh_dump_exceptions+0xb3/0x260\n    rt6_dump_route+0x53e/0x5f0\n    fib6_dump_node+0x6d/0xf0\n    fib6_walk_continue+0x290/0x2d0\n    fib6_dump_table+0x28d/0x360\n    inet6_dump_fib+0x37d/0x620\n    rtnl_dumpit+0x7b/0xd0\n    netlink_dump+0x3ae/0x7e0\n    ...\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n  4 locks held by dumper/549:\n    ...\n    #1: (rcu_read_lock){....}-{1:3}, at: inet6_dump_fib+0x88/0x620\n    #2: (&tb->tb6_lock){+.-.}-{3:3}, at: fib6_dump_table+0x1e9/0x360\n    #3: (rcu_read_lock){....}-{1:3}, at: rt6_dump_route+0x483/0x5f0\n\n  value changed: 0xffff8a7c44e05700 -> 0xffff8a7c45d60100\n\n  Reported by Kernel Concurrency Sanitizer on:\n  CPU: 14 UID: 0 PID: 549 Comm: dumper Not tainted\n  7.2.0-rc7-virtme #38 PREEMPT(lazy)\n  ...\n\nUse hlist_for_each_entry_rcu() to safely iterate over the exception list.","state":0,"publishedAt":"2026-09-24T15:28:55.977+00:00","modifiedAt":"2026-10-19T09:07:37.714+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/route.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"dffbfb3117138e8e0e09d05f507bd36ca1f696e5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"6bd3f94ed858f2d072627546b4cdf712b0f8ea88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"9c6be625e1a7258e845d6193b3b6b084a00f8e9e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"3665abc3d2ae8a78cb67f858e848481432ec75db\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"eda56ee17713f9dd834b922f7dbfa2e25fa6358c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"a602cd128d17a793e12888edc8eda85821ede7e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"f6b1b15848fd91fe122dac0d19d3d666e35075b6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9\",\n                            \"lessThan\": \"47cdab0d51aaa9bd85f8e4904585bd5bd4df4488\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/route.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/dffbfb3117138e8e0e09d05f507bd36ca1f696e5","https://git.kernel.org/stable/c/6bd3f94ed858f2d072627546b4cdf712b0f8ea88","https://git.kernel.org/stable/c/9c6be625e1a7258e845d6193b3b6b084a00f8e9e","https://git.kernel.org/stable/c/3665abc3d2ae8a78cb67f858e848481432ec75db","https://git.kernel.org/stable/c/eda56ee17713f9dd834b922f7dbfa2e25fa6358c","https://git.kernel.org/stable/c/a602cd128d17a793e12888edc8eda85821ede7e1","https://git.kernel.org/stable/c/f6b1b15848fd91fe122dac0d19d3d666e35075b6","https://git.kernel.org/stable/c/47cdab0d51aaa9bd85f8e4904585bd5bd4df4488"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93226","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93226","identifiers":["CVE-2026-93226"]},"retained":false,"historicalAffected":[]}],"coverage":[]}