{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98629", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.361Z", "datePublished": "2026-10-18T15:19:50.589Z", "dateUpdated": "2026-10-19T09:22:57.219Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:22:57.219Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: fix manual hash table handle IDR aliasing\n\nA u32 hash table created with an explicit handle ('tc filter add ...\nhandle 801: u32 divisor N') keys its IDR entry on the raw handle, while\nthe destroy paths free it under handle2id(handle). The two key domains\ndisagree for handles in the 0x800..0xFFF htid range:\nhandle2id() folds them back into the auto-allocated id space (1..0x7FF).\n\nA manual table therefore leaves its raw-keyed IDR entry unreachable on\ndelete (a permanent leak), and its delete can drop the idr entry of an\nunrelated live auto table. A later auto allocation can then hand out a\nhandle that aliases the live manual table; u32_lookup_ht() first-match\nroutes lookups and TCA_U32_LINK for that htid to the wrong table.\n\nKey the divisor-path alloc on handle2id(handle) so allocation and\nremoval share one key domain. A manual handle that maps onto an id\nalready in use is rejected with -ENOSPC, and auto allocation skips ids\nheld by live manual tables.\n\nConditions to recreate:\n ip link add test0 type dummy\n tc qdisc add dev test0 clsact\n tc filter add dev test0 ingress protocol ip pref 1 \\\n handle 801: u32 divisor 16\n tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16\n tc -d filter show dev test0 ingress | grep 'fh 801:'\n # unpatched: two live tables with handle 0x80100000 (the pref 2 root\n # hnode is auto-allocated id 1); patched: the auto hnode takes id 2.\n\nAlso tested with a poc with a live u32 table on the block, add/delete a manual\ntable 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with\n-ENOSPC because the raw key leaked on the first delete." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/cls_u32.c" ], "versions": [ { "version": "9b2c3184e126b941dfa716b8128ed6db92a64e2f", "lessThan": "21fc07924e996e1e661268ca269c86b8d59d25b3", "status": "affected", "versionType": "git" }, { "version": "789f9963bd031c3a185605665b744912df8e7eda", "lessThan": "0fac292d93fdb313099e98cce928b3a524c92c94", "status": "affected", "versionType": "git" }, { "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "54a454c5e41f5e2cb70c8163140ce095c5d5eefd", "status": "affected", "versionType": "git" }, { "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "f6696481eedfd5752b4b56eed715d0b0fe48b9c5", "status": "affected", "versionType": "git" }, { "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "2f898f9ec7c73c5697ee462681e7ea6984ee1f3d", "status": "affected", "versionType": "git" }, { "version": "73af53d82076bbe184d9ece9e14b0dc8599e6055", "lessThan": "0a5f5d9e94dead312d32c366b917c64e552b72f7", "status": "affected", "versionType": "git" }, { "version": "4403f9293ce9ecc2a55c688d84ee37e3ba0fc1a8", "status": "affected", "versionType": "git" }, { "version": "6.1.119", "lessThan": "6.1.189", "status": "affected", "versionType": "semver" }, { "version": "6.6.63", "lessThan": "6.6.158", "status": "affected", "versionType": "semver" }, { "version": "6.11.10", "lessThan": "6.12", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sched/cls_u32.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "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": "6.1.119", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.63", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/21fc07924e996e1e661268ca269c86b8d59d25b3" }, { "url": "https://git.kernel.org/stable/c/0fac292d93fdb313099e98cce928b3a524c92c94" }, { "url": "https://git.kernel.org/stable/c/54a454c5e41f5e2cb70c8163140ce095c5d5eefd" }, { "url": "https://git.kernel.org/stable/c/f6696481eedfd5752b4b56eed715d0b0fe48b9c5" }, { "url": "https://git.kernel.org/stable/c/2f898f9ec7c73c5697ee462681e7ea6984ee1f3d" }, { "url": "https://git.kernel.org/stable/c/0a5f5d9e94dead312d32c366b917c64e552b72f7" } ], "title": "net/sched: cls_u32: fix manual hash table handle IDR aliasing", "x_generator": { "engine": "bippy-1.2.0" } } } }