{"id":"CVE-2026-97966","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: reset HTB scheduler topology before freeing queues\n\nHTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler\nqueues via otx2_qos_txschq_set_pa…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: reset HTB scheduler topology before freeing queues\n\nHTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler\nqueues via otx2_qos_txschq_set_pa…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-459"],"vendor":"Linux","product":"Linux","affected":["Linux >= 5e6808b4c68d7882971514ab3279926eb07c8b2d < 16c5c8ea5017952ff14c87626a45359d195dda6f","Linux >= 5e6808b4c68d7882971514ab3279926eb07c8b2d < 0aa2dd6eaa347c7aab448df0eec0afcfe7489885","Linux >= 5e6808b4c68d7882971514ab3279926eb07c8b2d < 621c99be42e3f5cb68a6af9480a255218a761c4e","Linux >= 5e6808b4c68d7882971514ab3279926eb07c8b2d < 2df186418e17b30b319cf9ff81aad137692ab107","Linux >= 5e6808b4c68d7882971514ab3279926eb07c8b2d < ef39fca8508597fa565cf2be72a884a712fb98af","Linux 6.5"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:21.490","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97966","references":[{"url":"https://git.kernel.org/stable/c/0aa2dd6eaa347c7aab448df0eec0afcfe7489885","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/16c5c8ea5017952ff14c87626a45359d195dda6f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2df186418e17b30b319cf9ff81aad137692ab107","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/621c99be42e3f5cb68a6af9480a255218a761c4e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ef39fca8508597fa565cf2be72a884a712fb98af","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97966.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97966"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541191"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97966"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97966"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97966.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.002,"epssPercentile":0.09727,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.873Z","slug":"CVE-2026-97966","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-pf: reset HTB scheduler topology before freeing queues\n\nHTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler\nqueues via otx2_qos_txschq_set_parent_topology(), but teardown freed\nthose queues without clearing TOPOLOGY.  The AF only restores PARENT and\nSCHEDULE on free, so PRIO_ANCHOR/RR_PRIO settings can survive in the\nshared scheduler pool and affect later allocations.\n\nAdd otx2_qos_reset_schq_topology() and otx2_qos_free_hw_schq() to zero\nTL4 through TL2 TOPOLOGY before each schq is returned to the AF during\nhierarchy teardown and cfg rollback.  Skip the aggregation level (TL1):\nit is a per-tx-link queue shared by the PF, default Tx hierarchy and VFs,\nand is not freed back to the AF by nix_txschq_free_one().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97966.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":213345,"id":"CVE-2026-97966","ts":1790754697102,"field":"cvss","old":null,"new":"5.5"},{"seq":213344,"id":"CVE-2026-97966","ts":1790754697102,"field":"severity","old":"none","new":"medium"}]}