{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21703","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-29T08:45:45.751Z","datePublished":"2025-02-18T14:37:44.261Z","dateUpdated":"2026-04-02T08:39:25.388Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-04-02T08:39:25.388Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: Update sch->q.qlen before qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() notifies parent qdisc only if child\nqdisc becomes empty, therefore we need to reduce the backlog of the\nchild qdisc before calling it. Otherwise it would miss the opportunity\nto call cops->qlen_notify(), in the case of DRR, it resulted in UAF\nsince DRR uses ->qlen_notify() to maintain its active list."}],"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_netem.c"],"versions":[{"version":"83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31","lessThan":"e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c","status":"affected","versionType":"git"},{"version":"216509dda290f6db92c816dd54b83c1df9da9e76","lessThan":"7f31d74fcc556a9166b1bb20515542de7bb939d1","status":"affected","versionType":"git"},{"version":"c2047b0e216c8edce227d7c42f99ac2877dad0e4","lessThan":"98a2c685293aae122f688cde11d9334dddc5d207","status":"affected","versionType":"git"},{"version":"10df49cfca73dfbbdb6c4150d859f7e8926ae427","lessThan":"7b79ca9a1de6a428d486ff52fb3d602321c08f55","status":"affected","versionType":"git"},{"version":"3824c5fad18eeb7abe0c4fc966f29959552dca3e","lessThan":"1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5","status":"affected","versionType":"git"},{"version":"356078a5c55ec8d2061fcc009fb8599f5b0527f9","lessThan":"6312555249082d6d8cc5321ff725df05482d8b83","status":"affected","versionType":"git"},{"version":"f8d4bc455047cf3903cd6f85f49978987dbb3027","lessThan":"839ecc583fa00fab785fde1c85a326743657fd32","status":"affected","versionType":"git"},{"version":"f8d4bc455047cf3903cd6f85f49978987dbb3027","lessThan":"638ba5089324796c2ee49af10427459c2de35f71","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_netem.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"5.4.291","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.235","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.179","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.129","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.78","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.14","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13.3","lessThanOrEqual":"6.13.*","status":"unaffected","versionType":"semver"},{"version":"6.14","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":"5.4.288","versionEndExcluding":"5.4.291"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.232","versionEndExcluding":"5.10.235"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.175","versionEndExcluding":"5.15.179"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.121","versionEndExcluding":"6.1.129"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.67","versionEndExcluding":"6.6.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.6","versionEndExcluding":"6.12.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c"},{"url":"https://git.kernel.org/stable/c/7f31d74fcc556a9166b1bb20515542de7bb939d1"},{"url":"https://git.kernel.org/stable/c/98a2c685293aae122f688cde11d9334dddc5d207"},{"url":"https://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55"},{"url":"https://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5"},{"url":"https://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83"},{"url":"https://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32"},{"url":"https://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71"}],"title":"netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21703","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2025-02-18T15:38:37.163490Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-416","description":"CWE-416 Use After Free"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-02-18T15:46:03.772Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T19:35:52.049Z"}}]}}