{"id":"CVE-2025-37913","revision":null,"records":[{"revision":"12df89d1db4b4f07aa5a034b7179b1da","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-37913","aliases":[],"title":"net_sched: qfq: Fix double list add in class with netem as child qdisc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: qfq: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of qfq, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nThis patch checks whether the class was already added to the agg->active\nlist (cl_is_active) before doing the addition to cater for the reentrant\ncase.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/","state":0,"publishedAt":"2025-05-20T15:21:44.793+00:00","modifiedAt":"2026-10-15T21:52:02.947+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sched/sch_qfq.c\"\n ],\n \"versions\": [\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"041f410aec2c1751ee22b8b73ba05d38c3a6a602\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"005a479540478a820c52de098e5e767e63e36f0a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"0bf32d6fb1fcbf841bb9945570e0e2a70072c00f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"a43783119e01849fbf2fe8855634e8989b240cb4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"53bc0b55178bd59bdd4bcd16349505cabf54b1a2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"370218e8ce711684acc4cdd3cc3c6dd7956bc165\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n \"lessThan\": \"f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sched/sch_qfq.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.294\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.238\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.182\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.138\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.90\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.28\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14.6\",\n \"lessThanOrEqual\": \"6.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.15\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/041f410aec2c1751ee22b8b73ba05d38c3a6a602","https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a","https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f","https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb","https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4","https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2","https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165","https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-37913","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-37913","identifiers":["CVE-2025-37913"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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