{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-37890","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.963Z","datePublished":"2025-05-16T13:01:12.798Z","dateUpdated":"2026-05-11T21:17:06.552Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:17:06.552Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc\n\nAs described in Gerrard's report [1], we have a UAF case when an hfsc class\nhas a netem child qdisc. The crux of the issue is that hfsc is assuming\nthat checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted\nthe class in the vttree or eltree (which is not true for the netem\nduplicate case).\n\nThis patch checks the n_active class variable to make sure that the code\nwon't insert the class in the vttree or eltree twice, catering for the\nreentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_hfsc.c"],"versions":[{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"273bbcfa53541cde38b2003ad88a59b770306421","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"e0cf8ee23e1915431f262a7b2dee0c7a7d699af0","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"e3e949a39a91d1f829a4890e7dfe9417ac72e4d0","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"8df7d37d626430035b413b97cee18396b3450bef","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"6082a87af4c52f58150d40dec1716011d871ac21","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"2e7093c7a8aba5d4f8809f271488e5babe75e202","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"ac39fd4a757584d78ed062d4f6fd913f83bd98b5","status":"affected","versionType":"git"},{"version":"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea","lessThan":"141d34391abbb315d68556b7c67ad97885407547","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_hfsc.c"],"versions":[{"version":"5.0","status":"affected"},{"version":"0","lessThan":"5.0","status":"unaffected","versionType":"semver"},{"version":"5.4.294","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.238","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.182","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.138","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.90","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.28","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.14.6","lessThanOrEqual":"6.14.*","status":"unaffected","versionType":"semver"},{"version":"6.15","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":"5.0","versionEndExcluding":"5.4.294"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.238"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.15.182"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.1.138"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.6.90"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.12.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.14.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421"},{"url":"https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0"},{"url":"https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0"},{"url":"https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef"},{"url":"https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21"},{"url":"https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202"},{"url":"https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5"},{"url":"https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547"}],"title":"net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T19:57:02.260Z"}}]}}