{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-22999","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.938Z","datePublished":"2026-01-25T14:36:13.909Z","dateUpdated":"2026-05-11T21:58:02.934Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:58:02.934Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: do not free existing class in qfq_change_class()\n\nFixes qfq_change_class() error case.\n\ncl->qdisc and cl should only be freed if a new class and qdisc\nwere allocated, or we risk various UAF."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_qfq.c"],"versions":[{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"cff6cd703f41d8071995956142729e4bba160363","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"f06f7635499bc806cbe2bbc8805c7cef8b1edddf","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"0a234660dc70ce45d771cbc76b20d925b73ec160","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"362e269bb03f7076ba9990e518aeddb898232e50","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"e9d8f11652fa08c647bf7bba7dd8163241a332cd","status":"affected","versionType":"git"},{"version":"462dbc9101acd38e92eda93c0726857517a24bbd","lessThan":"3879cffd9d07aa0377c4b8835c4f64b4fb24ac78","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_qfq.c"],"versions":[{"version":"3.8","status":"affected"},{"version":"0","lessThan":"3.8","status":"unaffected","versionType":"semver"},{"version":"5.10.249","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.199","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.122","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.67","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.7","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","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":"3.8","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.12.67"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.18.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e"},{"url":"https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363"},{"url":"https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf"},{"url":"https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160"},{"url":"https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50"},{"url":"https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd"},{"url":"https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78"}],"title":"net/sched: sch_qfq: do not free existing class in qfq_change_class()","x_generator":{"engine":"bippy-1.2.0"}}}}