GHSA-M5MF-8Q2J-8CGP
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
octeontx2-pf: reset HTB scheduler topology before freeing queues
HTB offload programs NIX_AF_TLxX_TOPOLOGY on QoS-allocated scheduler queues via otx2_qos_txschq_set_parent_topology(), but teardown freed those queues without clearing TOPOLOGY. The AF only restores PARENT and SCHEDULE on free, so PRIO_ANCHOR/RR_PRIO settings can survive in the shared scheduler pool and affect later allocations.
Add otx2_qos_reset_schq_topology() and otx2_qos_free_hw_schq() to zero TL4 through TL2 TOPOLOGY before each schq is returned to the AF during hierarchy teardown and cfg rollback. Skip the aggregation level (TL1): it is a per-tx-link queue shared by the PF, default Tx hierarchy and VFs, and is not freed back to the AF by nix_txschq_free_one().
{
"affected": [],
"aliases": [
"CVE-2026-97966"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:24Z",
"severity": null
},
"details": "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_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().",
"id": "GHSA-m5mf-8q2j-8cgp",
"modified": "2026-09-25T12:31:30Z",
"published": "2026-09-25T12:31:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97966"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0aa2dd6eaa347c7aab448df0eec0afcfe7489885"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2df186418e17b30b319cf9ff81aad137692ab107"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/621c99be42e3f5cb68a6af9480a255218a761c4e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ef39fca8508597fa565cf2be72a884a712fb98af"
}
],
"schema_version": "1.4.0",
"severity": []
}
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