{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93226", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.094Z", "datePublished": "2026-09-24T15:28:55.977Z", "dateUpdated": "2026-10-19T09:07:37.714Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:07:37.714Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/route.c" ], "versions": [ { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "dffbfb3117138e8e0e09d05f507bd36ca1f696e5", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "6bd3f94ed858f2d072627546b4cdf712b0f8ea88", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "9c6be625e1a7258e845d6193b3b6b084a00f8e9e", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "3665abc3d2ae8a78cb67f858e848481432ec75db", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "eda56ee17713f9dd834b922f7dbfa2e25fa6358c", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "a602cd128d17a793e12888edc8eda85821ede7e1", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "f6b1b15848fd91fe122dac0d19d3d666e35075b6", "status": "affected", "versionType": "git" }, { "version": "1e47b4837f3bdaa425727cfe09f5ae3b6c4c41a9", "lessThan": "47cdab0d51aaa9bd85f8e4904585bd5bd4df4488", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/route.c" ], "versions": [ { "version": "5.3", "status": "affected" }, { "version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/dffbfb3117138e8e0e09d05f507bd36ca1f696e5" }, { "url": "https://git.kernel.org/stable/c/6bd3f94ed858f2d072627546b4cdf712b0f8ea88" }, { "url": "https://git.kernel.org/stable/c/9c6be625e1a7258e845d6193b3b6b084a00f8e9e" }, { "url": "https://git.kernel.org/stable/c/3665abc3d2ae8a78cb67f858e848481432ec75db" }, { "url": "https://git.kernel.org/stable/c/eda56ee17713f9dd834b922f7dbfa2e25fa6358c" }, { "url": "https://git.kernel.org/stable/c/a602cd128d17a793e12888edc8eda85821ede7e1" }, { "url": "https://git.kernel.org/stable/c/f6b1b15848fd91fe122dac0d19d3d666e35075b6" }, { "url": "https://git.kernel.org/stable/c/47cdab0d51aaa9bd85f8e4904585bd5bd4df4488" } ], "title": "ipv6: use RCU iterator to dump route exceptions", "x_generator": { "engine": "bippy-1.2.0" } } } }