192 lines
10 KiB
JSON
192 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-23200",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-01-13T15:37:45.986Z",
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"datePublished": "2026-02-14T16:27:25.025Z",
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"dateUpdated": "2026-11-05T21:23:21.838Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-23T16:04:06.072Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix ECMP sibling count mismatch when clearing RTF_ADDRCONF\n\nsyzbot reported a kernel BUG in fib6_add_rt2node() when adding an IPv6\nroute. [0]\n\nCommit f72514b3c569 (\"ipv6: clear RA flags when adding a static\nroute\") introduced logic to clear RTF_ADDRCONF from existing routes\nwhen a static route with the same nexthop is added. However, this\ncauses a problem when the existing route has a gateway.\n\nWhen RTF_ADDRCONF is cleared from a route that has a gateway, that\nroute becomes eligible for ECMP, i.e. rt6_qualify_for_ecmp() returns\ntrue. The issue is that this route was never added to the\nfib6_siblings list.\n\nThis leads to a mismatch between the following counts:\n\n- The sibling count computed by iterating fib6_next chain, which\n includes the newly ECMP-eligible route\n\n- The actual siblings in fib6_siblings list, which does not include\n that route\n\nWhen a subsequent ECMP route is added, fib6_add_rt2node() hits\nBUG_ON(sibling->fib6_nsiblings != rt->fib6_nsiblings) because the\ncounts don't match.\n\nFix this by only clearing RTF_ADDRCONF when the existing route does\nnot have a gateway. Routes without a gateway cannot qualify for ECMP\nanyway (rt6_qualify_for_ecmp() requires fib_nh_gw_family), so clearing\nRTF_ADDRCONF on them is safe and matches the original intent of the\ncommit.\n\n[0]:\nkernel BUG at net/ipv6/ip6_fib.c:1217!\nOops: invalid opcode: 0000 [#1] SMP KASAN PTI\nCPU: 0 UID: 0 PID: 6010 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nRIP: 0010:fib6_add_rt2node+0x3433/0x3470 net/ipv6/ip6_fib.c:1217\n[...]\nCall Trace:\n <TASK>\n fib6_add+0x8da/0x18a0 net/ipv6/ip6_fib.c:1532\n __ip6_ins_rt net/ipv6/route.c:1351 [inline]\n ip6_route_add+0xde/0x1b0 net/ipv6/route.c:3946\n ipv6_route_ioctl+0x35c/0x480 net/ipv6/route.c:4571\n inet6_ioctl+0x219/0x280 net/ipv6/af_inet6.c:577\n sock_do_ioctl+0xdc/0x300 net/socket.c:1245\n sock_ioctl+0x576/0x790 net/socket.c:1366\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/ip6_fib.c"
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],
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"versions": [
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{
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"version": "cb2b0caa8ca93cbe39177516669bf699c74f7041",
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"lessThan": "50b7c7a255858a85c4636a1e990ca04591153dca",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "03f642caab84bbfd138e74f671bb436186ea7e82",
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"lessThan": "d8143c54ceeba232dc8a13aa0afa14a44b371d93",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3e5b25da0b4109a3e063759735e6ec4236ea5a05",
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"lessThan": "b8ad2d53f706aeea833d23d45c0758398fede580",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f72514b3c5698e4b900b25345e09f9ed33123de6",
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"lessThan": "bbf4a17ad9ffc4e3d7ec13d73ecd59dea149ed25",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "61d88ea0f30c88e4ea98793594943aed8f1fc9ab",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.17.13",
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"lessThan": "6.18",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/ip6_fib.c"
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],
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"versions": [
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{
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"version": "6.6.120",
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"lessThan": "6.6.124",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.63",
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"lessThan": "6.12.70",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.2",
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"lessThan": "6.18.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.120",
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"versionEndExcluding": "6.6.124"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.63",
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"versionEndExcluding": "6.12.70"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18.2",
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"versionEndExcluding": "6.18.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17.13"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/50b7c7a255858a85c4636a1e990ca04591153dca"
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},
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{
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"url": "https://git.kernel.org/stable/c/d8143c54ceeba232dc8a13aa0afa14a44b371d93"
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},
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{
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"url": "https://git.kernel.org/stable/c/b8ad2d53f706aeea833d23d45c0758398fede580"
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},
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{
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"url": "https://git.kernel.org/stable/c/bbf4a17ad9ffc4e3d7ec13d73ecd59dea149ed25"
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}
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],
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"title": "ipv6: Fix ECMP sibling count mismatch when clearing RTF_ADDRCONF",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-23200",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-05T21:22:11.025337Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-11-05T21:23:21.838Z"
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}
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}
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]
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}
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} |