{"api_version":"1","generated_at":"2026-04-19T01:10:49+00:00","cve":"CVE-2026-31422","urls":{"html":"https://cve.report/CVE-2026-31422","api":"https://cve.report/api/cve/CVE-2026-31422.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31422","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31422"},"summary":{"title":"net/sched: cls_flow: fix NULL pointer dereference on shared blocks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: fix NULL pointer dereference on shared blocks\n\nflow_change() calls tcf_block_q() and dereferences q->handle to derive\na default baseclass.  Shared blocks leave block->q NULL, causing a NULL\nderef when a flow filter without a fully qualified baseclass is created\non a shared block.\n\nCheck tcf_block_shared() before accessing block->q and return -EINVAL\nfor shared blocks.  This avoids the null-deref shown below:\n\n=======================================================================\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nRIP: 0010:flow_change (net/sched/cls_flow.c:508)\nCall Trace:\n tc_new_tfilter (net/sched/cls_api.c:2432)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)\n [...]\n=======================================================================","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-13 14:16:11","updated_at":"2026-04-18 09:16:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5","name":"https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e","name":"https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408","name":"https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08","name":"https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504","name":"https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc","name":"https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293","name":"https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449","name":"https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31422","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31422","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 57f94ac7e953eece5ed4819605a18f3cdfc63dcc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 942813276edeb1741fa5b0a73471beb4e495fa08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db cc707a4fd4c3b6ab2722e06bc359aa010e13d408 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 4a09f72007201c9f667dc47f64517ec23eea65e5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db a208c3e1232997e9317887294c20008dfcb75449 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 415ea0c973c754b9f375225807810eb9045f4293 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1abf272022cf1d18469405f47b4ec49c6a3125db 1a280dd4bd1d616a01d6ffe0de284c907b555504 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.253 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31422","cve":"CVE-2026-31422","epss":"0.000240000","percentile":"0.066100000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_flow.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"57f94ac7e953eece5ed4819605a18f3cdfc63dcc","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"942813276edeb1741fa5b0a73471beb4e495fa08","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"cc707a4fd4c3b6ab2722e06bc359aa010e13d408","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"4a09f72007201c9f667dc47f64517ec23eea65e5","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"a208c3e1232997e9317887294c20008dfcb75449","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"415ea0c973c754b9f375225807810eb9045f4293","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"1a280dd4bd1d616a01d6ffe0de284c907b555504","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_flow.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"4.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"4.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: fix NULL pointer dereference on shared blocks\n\nflow_change() calls tcf_block_q() and dereferences q->handle to derive\na default baseclass.  Shared blocks leave block->q NULL, causing a NULL\nderef when a flow filter without a fully qualified baseclass is created\non a shared block.\n\nCheck tcf_block_shared() before accessing block->q and return -EINVAL\nfor shared blocks.  This avoids the null-deref shown below:\n\n=======================================================================\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nRIP: 0010:flow_change (net/sched/cls_flow.c:508)\nCall Trace:\n tc_new_tfilter (net/sched/cls_api.c:2432)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)\n [...]\n======================================================================="}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:34.892Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc"},{"url":"https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08"},{"url":"https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408"},{"url":"https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5"},{"url":"https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e"},{"url":"https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449"},{"url":"https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293"},{"url":"https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504"}],"title":"net/sched: cls_flow: fix NULL pointer dereference on shared blocks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31422","datePublished":"2026-04-13T13:40:25.911Z","dateReserved":"2026-03-09T15:48:24.088Z","dateUpdated":"2026-04-18T08:59:34.892Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-13 14:16:11","lastModifiedDate":"2026-04-18 09:16:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31422","Ordinal":"1","Title":"net/sched: cls_flow: fix NULL pointer dereference on shared bloc","CVE":"CVE-2026-31422","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31422","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: fix NULL pointer dereference on shared blocks\n\nflow_change() calls tcf_block_q() and dereferences q->handle to derive\na default baseclass.  Shared blocks leave block->q NULL, causing a NULL\nderef when a flow filter without a fully qualified baseclass is created\non a shared block.\n\nCheck tcf_block_shared() before accessing block->q and return -EINVAL\nfor shared blocks.  This avoids the null-deref shown below:\n\n=======================================================================\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nRIP: 0010:flow_change (net/sched/cls_flow.c:508)\nCall Trace:\n tc_new_tfilter (net/sched/cls_api.c:2432)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)\n [...]\n=======================================================================","Type":"Description","Title":"net/sched: cls_flow: fix NULL pointer dereference on shared bloc"}]}}}