CVE-2026-97959

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97959", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.205Z", "datePublished": "2026-09-25T10:23:04.348Z", "dateUpdated": "2026-10-19T09:11:25.255Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:11:25.255Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_route: free emptied bucket on filter move\n\nroute4_change can move an existing filter to a different top-level\nbucket: route4_set_parms recomputes the handle from TCA_ROUTE4_TO/\nFROM/IIF, and the handle-mismatch check is gated on the 'new' flag, so\nfor an existing filter the new handle may differ from the old one and\nland in a different bucket. When this happens, the filter is unlinked\nfrom the old bucket, but the bucket itself is never freed once it goes\nempty. The stale empty bucket remains in head->table[], causing\nroute4_delete to report *last=false even after the last live filter is\ngone. That pins the empty tcf_proto and causes a leak.\n\nFix this by refcounting the filters linked to a bucket and freeing the\nbucket when the count drops to zero. The existing scan in route4_delete\ngoes away with it.\n\nThe count is updated at all sites that link or unlink a filter during add,\nchange and delete, and the bucket is dropped from head->table[] as soon as\nit reaches zero.\n\nConditions to recreate the bug:\n CONFIG_NET_CLS_ROUTE4=y, CONFIG_NET_SCH_INGRESS=y, CONFIG_NET_CLS_ACT=y.\n\n tc qdisc replace dev lo clsact\n tc filter add dev lo ingress protocol ip pref 100 route from 1 to 1\n tc filter change dev lo ingress protocol ip pref 100 handle 0x10001 \\\n route from 1 to 2\n tc filter del dev lo ingress protocol ip pref 100 handle 0x10002 \\\n route from 1 to 2\n tc filter show dev lo ingress | grep -c 'pref 100 route chain 0 '"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_route.c"], "versions": [{"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "9e7741b41a25b9d49df4d262fa314342e6f95c50", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "48d38bf8c22a05fde07ba1f885cde27b851649a2", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "cc99d26b12431e4e4d0e346ec32764eb42c0aed9", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "41e94079200aaf0cdbe4594b0af75710b33da124", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "2e2f130951d34871b0643bf700164d97cff4b427", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "f8495d67434e1cb7e511297687ca55fdb28e4c20", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "81dd117c04422c6d0c7974aba9fa6a0ba370959b", "status": "affected", "versionType": "git"}, {"version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "lessThan": "1853f30cf5c84971f99788a76207c6f745380896", "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/cls_route.c"], "versions": [{"version": "4.1", "status": "affected"}, {"version": "0", "lessThan": "4.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "4.1", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9e7741b41a25b9d49df4d262fa314342e6f95c50"}, {"url": "https://git.kernel.org/stable/c/48d38bf8c22a05fde07ba1f885cde27b851649a2"}, {"url": "https://git.kernel.org/stable/c/cc99d26b12431e4e4d0e346ec32764eb42c0aed9"}, {"url": "https://git.kernel.org/stable/c/41e94079200aaf0cdbe4594b0af75710b33da124"}, {"url": "https://git.kernel.org/stable/c/2e2f130951d34871b0643bf700164d97cff4b427"}, {"url": "https://git.kernel.org/stable/c/f8495d67434e1cb7e511297687ca55fdb28e4c20"}, {"url": "https://git.kernel.org/stable/c/81dd117c04422c6d0c7974aba9fa6a0ba370959b"}, {"url": "https://git.kernel.org/stable/c/1853f30cf5c84971f99788a76207c6f745380896"}], "title": "net/sched: cls_route: free emptied bucket on filter move", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/cls_route.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9e7741b41a25b9d49df4d262fa314342e6f95c50", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "48d38bf8c22a05fde07ba1f885cde27b851649a2", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "cc99d26b12431e4e4d0e346ec32764eb42c0aed9", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "41e94079200aaf0cdbe4594b0af75710b33da124", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "2e2f130951d34871b0643bf700164d97cff4b427", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "f8495d67434e1cb7e511297687ca55fdb28e4c20", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "81dd117c04422c6d0c7974aba9fa6a0ba370959b", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}, {"lessThan": "1853f30cf5c84971f99788a76207c6f745380896", "status": "affected", "version": "1e052be69d045c8d0f82ff1116fd3e5a79661745", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/cls_route.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.1"}, {"lessThan": "4.1", "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": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_route: free emptied bucket on filter move\n\nroute4_change can move an existing filter to a different top-level\nbucket: route4_set_parms recomputes the handle from TCA_ROUTE4_TO/\nFROM/IIF, and the handle-mismatch check is gated on the 'new' flag, so\nfor an existing filter the new handle may differ from the old one and\nland in a different bucket. When this happens, the filter is unlinked\nfrom the old bucket, but the bucket itself is never freed once it goes\nempty. The stale empty bucket remains in head->table[], causing\nroute4_delete to report *last=false even after the last live filter is\ngone. That pins the empty tcf_proto and causes a leak.\n\nFix this by refcounting the filters linked to a bucket and freeing the\nbucket when the count drops to zero. The existing scan in route4_delete\ngoes away with it.\n\nThe count is updated at all sites that link or unlink a filter during add,\nchange and delete, and the bucket is dropped from head->table[] as soon as\nit reaches zero.\n\nConditions to recreate the bug:\n CONFIG_NET_CLS_ROUTE4=y, CONFIG_NET_SCH_INGRESS=y, CONFIG_NET_CLS_ACT=y.\n\n tc qdisc replace dev lo clsact\n tc filter add dev lo ingress protocol ip pref 100 route from 1 to 1\n tc filter change dev lo ingress protocol ip pref 100 handle 0x10001 \\\n route from 1 to 2\n tc filter del dev lo ingress protocol ip pref 100 handle 0x10002 \\\n route from 1 to 2\n tc filter show dev lo ingress | grep -c 'pref 100 route chain 0 '"}], "id": "CVE-2026-97959", "lastModified": "2026-10-19T10:17:47.253", "metrics": {}, "published": "2026-09-25T11:17:23.600", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1853f30cf5c84971f99788a76207c6f745380896"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2e2f130951d34871b0643bf700164d97cff4b427"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/41e94079200aaf0cdbe4594b0af75710b33da124"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48d38bf8c22a05fde07ba1f885cde27b851649a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81dd117c04422c6d0c7974aba9fa6a0ba370959b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e7741b41a25b9d49df4d262fa314342e6f95c50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc99d26b12431e4e4d0e346ec32764eb42c0aed9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f8495d67434e1cb7e511297687ca55fdb28e4c20"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: cls_route: free emptied bucket on filter move", "id": "2541221", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541221"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: cls_route: free emptied bucket on filter move\nroute4_change can move an existing filter to a different top-level\nbucket: route4_set_parms recomputes the handle from TCA_ROUTE4_TO/\nFROM/IIF, and the handle-mismatch check is gated on the 'new' flag, so\nfor an existing filter the new handle may differ from the old one and\nland in a different bucket. When this happens, the filter is unlinked\nfrom the old bucket, but the bucket itself is never freed once it goes\nempty. The stale empty bucket remains in head->table[], causing\nroute4_delete to report *last=false even after the last live filter is\ngone. That pins the empty tcf_proto and causes a leak.\nFix this by refcounting the filters linked to a bucket and freeing the\nbucket when the count drops to zero. The existing scan in route4_delete\ngoes away with it.\nThe count is updated at all sites that link or unlink a filter during add,\nchange and delete, and the bucket is dropped from head->table[] as soon as\nit reaches zero.\nConditions to recreate the bug:\nCONFIG_NET_CLS_ROUTE4=y, CONFIG_NET_SCH_INGRESS=y, CONFIG_NET_CLS_ACT=y.\ntc qdisc replace dev lo clsact\ntc filter add dev lo ingress protocol ip pref 100 route from 1 to 1\ntc filter change dev lo ingress protocol ip pref 100 handle 0x10001 \\\nroute from 1 to 2\ntc filter del dev lo ingress protocol ip pref 100 handle 0x10002 \\\nroute from 1 to 2\ntc filter show dev lo ingress | grep -c 'pref 100 route chain 0 '", "A flaw was found in the Linux kernel. When an existing cls_route traffic control filter is moved to a different bucket during configuration updates, the kernel fails to free the vacated bucket once it becomes empty. This failure leaves stale bucket references in place and prevents the associated protocol resources from being released, causing a memory leak. A local user with network administration capabilities can exploit this vulnerability through repeated filter updates to consume system memory, potentially resulting in a Denial of Service (DoS)."], "name": "CVE-2026-97959", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97959\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97959\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97959.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e052be69d045c8d0f82ff1116fd3e5a79661745,2e2f130951d34871b0643bf700164d97cff4b427)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e052be69d045c8d0f82ff1116fd3e5a79661745,f8495d67434e1cb7e511297687ca55fdb28e4c20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e052be69d045c8d0f82ff1116fd3e5a79661745,81dd117c04422c6d0c7974aba9fa6a0ba370959b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e052be69d045c8d0f82ff1116fd3e5a79661745,1853f30cf5c84971f99788a76207c6f745380896)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc3,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:00:20.849184+00:00", "updated": "2026-10-01T06:45:02.280358+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}