227 lines
12 KiB
JSON
227 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-2026-90248",
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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": "2026-09-11T19:38:34.795Z",
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"datePublished": "2026-09-17T16:07:50.104Z",
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"dateUpdated": "2026-10-19T09:00:24.022Z"
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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": "2026-10-19T09:00:24.022Z"
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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\nnet/sched: cls_api: fix teardown of an adopted proto on insert-race loss\n\nIn tc_new_tfilter() the create branch sets tp_created = 1 before calling\ntcf_chain_tp_insert_unique(). When the caller loses the race (another\nrequest inserted a proto at the same chain/prio first), insert_unique()\ndestroys the caller's own tp_new and returns the winner's proto with an\nextra reference. tp_created was never cleared, so the loser's errout\npath treated the winner's live proto as its own and called\ntcf_chain_tp_delete_empty() on it, silently unlinking an active\nclassifier that the winning request already advertised via\nRTM_NEWTFILTER.\n\nTrack the outcome of the insert step in a single tri-state variable so\neach errout path reacts correctly:\n\n- TP_NOT_CREATED: no proto created; pursue the old path.\n- TP_CREATED: proto inserted successfully; same code path as before.\n- TP_NOT_OWNED: New - lost the insert race; tp is another request's proto\n (chain ref already released by tp_new's destroy)\n\nBoth errout reactions are single expressions derived from the state.\n\nThis fix is motivated by the Sashiko's automated review of Patch\n(net/sched: cls_api: Always acquire rtnl_lock when destroying locked\nclassifiers) [1][2]. The review identified the silent-unlink behaviour of\nan adopted proto's teardown when a request loses the\ntcf_chain_tp_insert_unique() race.\n\n[1] https://sashiko.dev/#/patchset/20260801125632.360365-1-jhs%40mojatatu.com\n[2] https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260801125632.360365-1-jhs%40mojatatu.com"
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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/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "a68e664ddf16ecae6d769d6a2eb356f8abab75c9",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "df02b6dc136af45e92ee4c86f4aa6c9a60790b1e",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "bee2208276c8e0e40a249ffdcf6e5434a79a847c",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "219c87aeefdcc8c1caf28cc99e9b361ce7393d3a",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "bbe2fd6d77df630356185406a97317f6aa6a92cf",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "dc8b33b819cb02a75936940c120aa669ad89942d",
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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": "8b64678e0af8f4d62a40149baedebe78503a5255",
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"lessThan": "d4e359b3608a0e184bbe8d61a5c3b50d0831c44a",
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"status": "affected",
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"versionType": "git"
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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/sched/cls_api.c"
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],
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"versions": [
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{
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"version": "5.1",
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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": "5.1",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.1",
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"versionEndExcluding": "5.15.221"
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},
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"vulnerable": true,
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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/a68e664ddf16ecae6d769d6a2eb356f8abab75c9"
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},
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{
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"url": "https://git.kernel.org/stable/c/df02b6dc136af45e92ee4c86f4aa6c9a60790b1e"
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"url": "https://git.kernel.org/stable/c/219c87aeefdcc8c1caf28cc99e9b361ce7393d3a"
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},
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{
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"url": "https://git.kernel.org/stable/c/bbe2fd6d77df630356185406a97317f6aa6a92cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc8b33b819cb02a75936940c120aa669ad89942d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d4e359b3608a0e184bbe8d61a5c3b50d0831c44a"
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}
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],
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"title": "net/sched: cls_api: fix teardown of an adopted proto on insert-race loss",
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