CVE-2026-23124 (GCVE-0-2026-23124)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:09 – Updated: 2026-06-11 18:44
VLAI
Title
ipv6: annotate data-race in ndisc_router_discovery()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: annotate data-race in ndisc_router_discovery() syzbot found that ndisc_router_discovery() could read and write in6_dev->ra_mtu without holding a lock [1] This looks fine, IFLA_INET6_RA_MTU is best effort. Add READ_ONCE()/WRITE_ONCE() to document the race. Note that we might also reject illegal MTU values (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) in a future patch. [1] BUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery read to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1: ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558 ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841 icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989 ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438 ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500 ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590 dst_input include/net/dst.h:474 [inline] ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ... write to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0: ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559 ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841 icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989 ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438 ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500 ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590 dst_input include/net/dst.h:474 [inline] ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ... value changed: 0x00000000 -> 0xe5400659
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < 4630897eb1a039b5d7b737b8dc9521d9d4b568b5 (git)
Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < 2619499169fb1c2ac4974b0f2d87767fb543582b (git)
Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < fad8f4ff7928f4d52a062ffdcffa484989c79c47 (git)
Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < 2a2b9d25f801afecf2f83cacce98afa8fd73e3c9 (git)
Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < e3c1040252e598f7b4e33a42dc7c38519bc22428 (git)
Affected: 49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 , < 9a063f96d87efc3a6cc667f8de096a3d38d74bb5 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: annotate data-race in ndisc_router_discovery()\n\nsyzbot found that ndisc_router_discovery() could read and write\nin6_dev-\u003era_mtu without holding a lock [1]\n\nThis looks fine, IFLA_INET6_RA_MTU is best effort.\n\nAdd READ_ONCE()/WRITE_ONCE() to document the race.\n\nNote that we might also reject illegal MTU values\n(mtu \u003c IPV6_MIN_MTU || mtu \u003e skb-\u003edev-\u003emtu) in a future patch.\n\n[1]\nBUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery\n\nread to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1:\n  ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\n  NF_HOOK include/linux/netfilter.h:318 [inline]\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\n  dst_input include/net/dst.h:474 [inline]\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\n...\n\nwrite to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0:\n  ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\n  NF_HOOK include/linux/netfilter.h:318 [inline]\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\n  dst_input include/net/dst.h:474 [inline]\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\n...\n\nvalue changed: 0x00000000 -\u003e 0xe5400659"
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      "date": "2026-07-16",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23124\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T15:16:07.633\",\"lastModified\":\"2026-06-17T10:20:56.530\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: annotate data-race in ndisc_router_discovery()\\n\\nsyzbot found that ndisc_router_discovery() could read and write\\nin6_dev-\u003era_mtu without holding a lock [1]\\n\\nThis looks fine, IFLA_INET6_RA_MTU is best effort.\\n\\nAdd READ_ONCE()/WRITE_ONCE() to document the race.\\n\\nNote that we might also reject illegal MTU values\\n(mtu \u003c IPV6_MIN_MTU || mtu \u003e skb-\u003edev-\u003emtu) in a future patch.\\n\\n[1]\\nBUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery\\n\\nread to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1:\\n  ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nwrite to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0:\\n  ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nvalue changed: 0x00000000 -\u003e 0xe5400659\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nipv6: anotar condici\u00f3n de carrera de datos en ndisc_router_discovery()\\n\\nsyzbot encontr\u00f3 que ndisc_router_discovery() pod\u00eda leer y escribir in6_dev-\u0026gt;ra_mtu sin mantener un bloqueo [1]\\n\\nEsto parece estar bien, IFLA_INET6_RA_MTU es de mejor esfuerzo.\\n\\nA\u00f1adir READ_ONCE()/WRITE_ONCE() para documentar la condici\u00f3n de carrera.\\n\\nTenga en cuenta que tambi\u00e9n podr\u00edamos rechazar valores MTU ilegales (mtu \u0026lt; IPV6_MIN_MTU || mtu \u0026gt; skb-\u0026gt;dev-\u0026gt;mtu) en un parche futuro.\\n\\n[1]\\nERROR: KCSAN: condici\u00f3n de carrera de datos en ndisc_router_discovery / ndisc_router_discovery\\n\\nlectura a 0xffff888119809c20 de 4 bytes por la tarea 25817 en la cpu 1:\\n  ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nescritura a 0xffff888119809c20 de 4 bytes por la tarea 25816 en la cpu 0:\\n  ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nvalor cambiado: 0x00000000 -\u0026gt; 0xe5400659\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ndisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"4630897eb1a039b5d7b737b8dc9521d9d4b568b5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"2619499169fb1c2ac4974b0f2d87767fb543582b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"fad8f4ff7928f4d52a062ffdcffa484989c79c47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"2a2b9d25f801afecf2f83cacce98afa8fd73e3c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"e3c1040252e598f7b4e33a42dc7c38519bc22428\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\",\"lessThan\":\"9a063f96d87efc3a6cc667f8de096a3d38d74bb5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ndisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.199\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.162\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.122\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.68\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.8\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T20:40:30.553217Z\",\"id\":\"CVE-2026-23124\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"5.15.199\",\"matchCriteriaId\":\"3F9487DA-0705-4945-A8B3-1460DE840D0A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.162\",\"matchCriteriaId\":\"6579E0D4-0641-479D-A4C3-0EF618798C55\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.122\",\"matchCriteriaId\":\"8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.68\",\"matchCriteriaId\":\"52F38E19-0FDD-4992-9D6D-D4169D689598\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.8\",\"matchCriteriaId\":\"E65C6E79-7EBE-4C77-93F0-818CF5B38F4E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2619499169fb1c2ac4974b0f2d87767fb543582b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a2b9d25f801afecf2f83cacce98afa8fd73e3c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4630897eb1a039b5d7b737b8dc9521d9d4b568b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a063f96d87efc3a6cc667f8de096a3d38d74bb5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e3c1040252e598f7b4e33a42dc7c38519bc22428\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fad8f4ff7928f4d52a062ffdcffa484989c79c47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T12:23:05+00:00",
      "cve": "CVE-2026-23124",
      "id": "CVE-2026-23124",
      "initial_release_date": "2026-02-14T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Data race in IPv6 neighbor discovery leads to limited availability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23124.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23124\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:40:30.553217Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:37:22.998Z\"}}], \"cna\": {\"title\": \"ipv6: annotate data-race in ndisc_router_discovery()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7\", \"lessThan\": \"4630897eb1a039b5d7b737b8dc9521d9d4b568b5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"references\": [{\"url\": \"https://git.kernel.org/stable/c/4630897eb1a039b5d7b737b8dc9521d9d4b568b5\"}, {\"url\": \"https://git.kernel.org/stable/c/2619499169fb1c2ac4974b0f2d87767fb543582b\"}, {\"url\": \"https://git.kernel.org/stable/c/fad8f4ff7928f4d52a062ffdcffa484989c79c47\"}, {\"url\": \"https://git.kernel.org/stable/c/2a2b9d25f801afecf2f83cacce98afa8fd73e3c9\"}, {\"url\": \"https://git.kernel.org/stable/c/e3c1040252e598f7b4e33a42dc7c38519bc22428\"}, {\"url\": \"https://git.kernel.org/stable/c/9a063f96d87efc3a6cc667f8de096a3d38d74bb5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: annotate data-race in ndisc_router_discovery()\\n\\nsyzbot found that ndisc_router_discovery() could read and write\\nin6_dev-\u003era_mtu without holding a lock [1]\\n\\nThis looks fine, IFLA_INET6_RA_MTU is best effort.\\n\\nAdd READ_ONCE()/WRITE_ONCE() to document the race.\\n\\nNote that we might also reject illegal MTU values\\n(mtu \u003c IPV6_MIN_MTU || mtu \u003e skb-\u003edev-\u003emtu) in a future patch.\\n\\n[1]\\nBUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery\\n\\nread to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1:\\n  ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nwrite to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0:\\n  ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559\\n  ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841\\n  icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989\\n  ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438\\n  ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489\\n  NF_HOOK include/linux/netfilter.h:318 [inline]\\n  ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500\\n  ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590\\n  dst_input include/net/dst.h:474 [inline]\\n  ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79\\n...\\n\\nvalue changed: 0x00000000 -\u003e 0xe5400659\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.122\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.68\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.8\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T22:00:35.572Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23124\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:02.234Z\", \"dateReserved\": \"2026-01-13T15:37:45.970Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-02-14T15:09:54.043Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.