CVE-2026-97966 (GCVE-0-2026-97966)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-09-25 10:23
VLAI
Title
octeontx2-pf: reset HTB scheduler topology before freeing queues
Summary
In 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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e6808b4c68d7882971514ab3279926eb07c8b2d , < 0aa2dd6eaa347c7aab448df0eec0afcfe7489885 (git)
Affected: 5e6808b4c68d7882971514ab3279926eb07c8b2d , < 621c99be42e3f5cb68a6af9480a255218a761c4e (git)
Affected: 5e6808b4c68d7882971514ab3279926eb07c8b2d , < 2df186418e17b30b319cf9ff81aad137692ab107 (git)
Affected: 5e6808b4c68d7882971514ab3279926eb07c8b2d , < ef39fca8508597fa565cf2be72a884a712fb98af (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/marvell/octeontx2/nic/qos.c"
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    "datePublished": "2026-09-25T10:23:08.543Z",
    "dateReserved": "2026-09-25T10:18:58.206Z",
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            "value": "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()."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.