{"api_version":"1","generated_at":"2026-10-22T01:49:00+00:00","cve":"CVE-2026-98622","urls":{"html":"https://cve.report/CVE-2026-98622","api":"https://cve.report/api/cve/CVE-2026-98622.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98622","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98622"},"summary":{"title":"net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: don't WARN on benign flow_offload_alloc() failure\n\nflow_offload_alloc() returns NULL when the conntrack entry is dying\n(e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation\nfails; both are expected under load and neither is a kernel bug. This\npath runs from softirq on every committed packet, so with\npanic_on_warn=1 an unprivileged user can panic the box just by racing\na conntrack flush against a `tc ... action ct commit` classifier.\n\nReproduced with a custom repro under QEMU: a small, fixed set of UDP\nflows through `tc filter ... action ct commit` on lo, raced against\nthreads flooding bare ctnetlink CT_DELETE (flush) requests. Hits\nWARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined\ninto tcf_ct_act() in this build) within ~15s on the unpatched kernel;\nsame setup is clean on the patched kernel. The fix itself is\nbehavior-preserving: both branches already did `goto err_alloc`\nbefore and after, only the WARN is removed.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:15","updated_at":"2026-10-19 10:19:26"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33","name":"https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67","name":"https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3","name":"https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2","name":"https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53","name":"https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a","name":"https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8","name":"https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096","name":"https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98622","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98622","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 e8fcf3f08834e939b797311742ee72b1e2a08096 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 af475f599270e59313552e6c6f3af8507da672b8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 424ba52c0058deeb940d02cba52eb0aeb288db33 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 d805560ad69cb266d669341ca01e26bffb0d2c67 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 00734f3684fcec42c319bedfe68a5d357c720b53 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 650787233c2fd6e515a7c5f371019a9fa080ccd2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64ff70b80fd403110b67dd9f7184a604fdb0da43 47abe7a5c4eb53269aca3506446f851572a059a3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.271 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/act_ct.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e8fcf3f08834e939b797311742ee72b1e2a08096","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"af475f599270e59313552e6c6f3af8507da672b8","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"424ba52c0058deeb940d02cba52eb0aeb288db33","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"d805560ad69cb266d669341ca01e26bffb0d2c67","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"00734f3684fcec42c319bedfe68a5d357c720b53","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"650787233c2fd6e515a7c5f371019a9fa080ccd2","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"},{"lessThan":"47abe7a5c4eb53269aca3506446f851572a059a3","status":"affected","version":"64ff70b80fd403110b67dd9f7184a604fdb0da43","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/act_ct.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: don't WARN on benign flow_offload_alloc() failure\n\nflow_offload_alloc() returns NULL when the conntrack entry is dying\n(e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation\nfails; both are expected under load and neither is a kernel bug. This\npath runs from softirq on every committed packet, so with\npanic_on_warn=1 an unprivileged user can panic the box just by racing\na conntrack flush against a `tc ... action ct commit` classifier.\n\nReproduced with a custom repro under QEMU: a small, fixed set of UDP\nflows through `tc filter ... action ct commit` on lo, raced against\nthreads flooding bare ctnetlink CT_DELETE (flush) requests. Hits\nWARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined\ninto tcf_ct_act() in this build) within ~15s on the unpatched kernel;\nsame setup is clean on the patched kernel. The fix itself is\nbehavior-preserving: both branches already did `goto err_alloc`\nbefore and after, only the WARN is removed."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:22:50.359Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096"},{"url":"https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8"},{"url":"https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33"},{"url":"https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a"},{"url":"https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67"},{"url":"https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53"},{"url":"https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2"},{"url":"https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3"}],"title":"net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98622","datePublished":"2026-10-18T15:19:42.514Z","dateReserved":"2026-09-25T10:25:14.360Z","dateUpdated":"2026-10-19T09:22:50.359Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:15","lastModifiedDate":"2026-10-19 10:19:26","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98622","Ordinal":"1","Title":"net/sched: act_ct: don't WARN on benign flow_offload_alloc() fai","CVE":"CVE-2026-98622","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98622","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: don't WARN on benign flow_offload_alloc() failure\n\nflow_offload_alloc() returns NULL when the conntrack entry is dying\n(e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation\nfails; both are expected under load and neither is a kernel bug. This\npath runs from softirq on every committed packet, so with\npanic_on_warn=1 an unprivileged user can panic the box just by racing\na conntrack flush against a `tc ... action ct commit` classifier.\n\nReproduced with a custom repro under QEMU: a small, fixed set of UDP\nflows through `tc filter ... action ct commit` on lo, raced against\nthreads flooding bare ctnetlink CT_DELETE (flush) requests. Hits\nWARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined\ninto tcf_ct_act() in this build) within ~15s on the unpatched kernel;\nsame setup is clean on the patched kernel. The fix itself is\nbehavior-preserving: both branches already did `goto err_alloc`\nbefore and after, only the WARN is removed.","Type":"Description","Title":"net/sched: act_ct: don't WARN on benign flow_offload_alloc() fai"}]}}}