251 lines
12 KiB
JSON
251 lines
12 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-2026-99074",
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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": "2026-09-25T10:25:14.389Z",
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"datePublished": "2026-10-23T12:23:17.866Z",
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"dateUpdated": "2026-10-30T12:41:33.126Z"
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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": "2026-10-30T12:41:33.126Z"
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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\nipv4: stop PMTU walk when nexthop group shrinks\n\nCommit 7d3f3b4367f3 (\"net: ipv4: Cache pmtu for all packet paths if\nmultipath enabled\") made __ip_rt_update_pmtu() update every path.\n\nFor nexthop objects, fib_info_num_path() and fib_info_nhc()\nindependently load nh->nh_grp. RCU protects each group's lifetime but\ndoes not make the loads observe the same group. If replacement shrinks\nthe group after the loop accepts an index, fib_info_nhc() returns NULL\nand update_or_create_fnhe() dereferences it.\n\nA deterministic probe only widened the existing window between the real\noperations. On v7.2, an RTM_NEWNEXTHOP replacement published a\none-member group after the PMTU reader accepted index 1 from a two-member\ngroup, producing:\n\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: update_or_create_fnhe+0x45/0x15b0\n\nStop when the indexed path is absent. Groups are dense, so no later\nindex exists in that snapshot. The same real-writer window completed\n114,423 PMTU iterations without an oops with this check. A reproducer\nis available on request.\n\nReplacement requires CAP_NET_ADMIN in the network namespace. Where\nunprivileged user namespaces are permitted, a local user can obtain it\nin a new user and network namespace."
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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/ipv4/route.c"
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],
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"versions": [
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{
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"version": "fc07a232326a623d0be482e307c08ea7049c2846",
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"lessThan": "82d83eec893d8ae84f280aec44c60d9fdecc62b5",
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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": "b1f7bdee5750d6cbb9497140cd6582abc5fdcb9e",
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"lessThan": "a411df69524f91fe3adb8f9544d33e701fc9732c",
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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": "3bed2abab4a682d426624ce9add9d7b6d475d4e4",
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"lessThan": "7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a",
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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": "7f5005457b3072fe1ddf15bfef869f2a1d98e05e",
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"lessThan": "c60d17d6dd61adc761ac6f65a008fefbc54cbf87",
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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": "7d3f3b4367f315a61fc615e3138f3d320da8c466",
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"lessThan": "c6d670ac656badfd0e15355e07a13a6bdf3b69fd",
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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": "7d3f3b4367f315a61fc615e3138f3d320da8c466",
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"lessThan": "f27483f9975b5065ff67054cc7eb8edac6083488",
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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": "7d3f3b4367f315a61fc615e3138f3d320da8c466",
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"lessThan": "6619e01855e65ef35723685a557e3eb106f4ecf5",
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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": "5.15.179",
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"lessThan": "5.15.224",
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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": "6.1.129",
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"lessThan": "6.1.191",
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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": "6.6.79",
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"lessThan": "6.6.160",
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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": "6.12.16",
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"lessThan": "6.12.113",
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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": "affected",
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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/ipv4/route.c"
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],
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"versions": [
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.113",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.11",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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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": "5.15.179",
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"versionEndExcluding": "5.15.224"
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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": "6.1.129",
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"versionEndExcluding": "6.1.191"
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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": "6.6.79",
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"versionEndExcluding": "6.6.160"
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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": "6.12.16",
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"versionEndExcluding": "6.12.113"
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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": "6.13",
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"versionEndExcluding": "6.18.57"
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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": "6.13",
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"versionEndExcluding": "7.2.11"
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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": "6.13",
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"versionEndExcluding": "7.3"
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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/82d83eec893d8ae84f280aec44c60d9fdecc62b5"
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},
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{
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"url": "https://git.kernel.org/stable/c/a411df69524f91fe3adb8f9544d33e701fc9732c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a"
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},
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{
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"url": "https://git.kernel.org/stable/c/c60d17d6dd61adc761ac6f65a008fefbc54cbf87"
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},
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{
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"url": "https://git.kernel.org/stable/c/c6d670ac656badfd0e15355e07a13a6bdf3b69fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/f27483f9975b5065ff67054cc7eb8edac6083488"
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},
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{
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"url": "https://git.kernel.org/stable/c/6619e01855e65ef35723685a557e3eb106f4ecf5"
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}
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],
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"title": "ipv4: stop PMTU walk when nexthop group shrinks",
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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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}
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} |