{"api_version":"1","generated_at":"2026-04-20T17:46:27+00:00","cve":"CVE-2026-23413","urls":{"html":"https://cve.report/CVE-2026-23413","api":"https://cve.report/api/cve/CVE-2026-23413.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23413","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23413"},"summary":{"title":"clsact: Fix use-after-free in init/destroy rollback asymmetry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-02 12:16:20","updated_at":"2026-04-03 16:10:52"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c","name":"https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69","name":"https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208","name":"https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe","name":"https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c","name":"https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23413","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23413","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 230bb13650b0f186f540500fd5f5f7096a822a2a a73d95b57bf9faebdfed591bcb7ed9292062a84c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cb6f0bae50441f4b4b32a28315853b279c7404e 37bef86e5428d59f70a4da82b80f9a8f252fecbe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cb6f0bae50441f4b4b32a28315853b279c7404e 4c9af67f99aa3e51b522c54968ab3ac8272be41c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cb6f0bae50441f4b4b32a28315853b279c7404e 0509b762bc5e8ea7b8391130730c6d8502fc6e69 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cb6f0bae50441f4b4b32a28315853b279c7404e a0671125d4f55e1e98d9bde8a0b671941987e208 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f61ecf1bd5b562ebfd7d430ccb31619857e80857 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.20 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.10 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0-rc5 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"23413","cve":"CVE-2026-23413","epss":"0.000180000","percentile":"0.046140000","score_date":"2026-04-07","updated_at":"2026-04-08 00:03:39"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/sch_generic.h","net/sched/sch_ingress.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a73d95b57bf9faebdfed591bcb7ed9292062a84c","status":"affected","version":"230bb13650b0f186f540500fd5f5f7096a822a2a","versionType":"git"},{"lessThan":"37bef86e5428d59f70a4da82b80f9a8f252fecbe","status":"affected","version":"1cb6f0bae50441f4b4b32a28315853b279c7404e","versionType":"git"},{"lessThan":"4c9af67f99aa3e51b522c54968ab3ac8272be41c","status":"affected","version":"1cb6f0bae50441f4b4b32a28315853b279c7404e","versionType":"git"},{"lessThan":"0509b762bc5e8ea7b8391130730c6d8502fc6e69","status":"affected","version":"1cb6f0bae50441f4b4b32a28315853b279c7404e","versionType":"git"},{"lessThan":"a0671125d4f55e1e98d9bde8a0b671941987e208","status":"affected","version":"1cb6f0bae50441f4b4b32a28315853b279c7404e","versionType":"git"},{"status":"affected","version":"f61ecf1bd5b562ebfd7d430ccb31619857e80857","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/sch_generic.h","net/sched/sch_ingress.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.10"},{"lessThan":"6.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.20","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0-rc5","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"6.6.41","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.20","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.10","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0-rc5","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other."}],"providerMetadata":{"dateUpdated":"2026-04-02T11:40:54.384Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c"},{"url":"https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe"},{"url":"https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c"},{"url":"https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69"},{"url":"https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208"}],"title":"clsact: Fix use-after-free in init/destroy rollback asymmetry","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-23413","datePublished":"2026-04-02T11:40:54.384Z","dateReserved":"2026-01-13T15:37:46.014Z","dateUpdated":"2026-04-02T11:40:54.384Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-02 12:16:20","lastModifiedDate":"2026-04-03 16:10:52","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23413","Ordinal":"1","Title":"clsact: Fix use-after-free in init/destroy rollback asymmetry","CVE":"CVE-2026-23413","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23413","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other.","Type":"Description","Title":"clsact: Fix use-after-free in init/destroy rollback asymmetry"}]}}}