octeontx2-pf: reset HTB scheduler topology before freeing queues

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Summary

CVECVE-2026-97966
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:24 UTC
Updated2026-10-19 10:17:48 UTC
DescriptionIn 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().

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.089000000 (date 2026-10-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e6808b4c68d7882971514ab3279926eb07c8b2d 16c5c8ea5017952ff14c87626a45359d195dda6f git Not specified
CNA Linux Linux affected 5e6808b4c68d7882971514ab3279926eb07c8b2d 0aa2dd6eaa347c7aab448df0eec0afcfe7489885 git Not specified
CNA Linux Linux affected 5e6808b4c68d7882971514ab3279926eb07c8b2d 621c99be42e3f5cb68a6af9480a255218a761c4e git Not specified
CNA Linux Linux affected 5e6808b4c68d7882971514ab3279926eb07c8b2d 2df186418e17b30b319cf9ff81aad137692ab107 git Not specified
CNA Linux Linux affected 5e6808b4c68d7882971514ab3279926eb07c8b2d ef39fca8508597fa565cf2be72a884a712fb98af git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ef39fca8508597fa565cf2be72a884a712fb98af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16c5c8ea5017952ff14c87626a45359d195dda6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2df186418e17b30b319cf9ff81aad137692ab107 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/621c99be42e3f5cb68a6af9480a255218a761c4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0aa2dd6eaa347c7aab448df0eec0afcfe7489885 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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