CVE-2026-43296 (GCVE-0-2026-43296)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-08-05 12:27
VLAI
Title
octeontx2-af: Workaround SQM/PSE stalls by disabling sticky
Summary
In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: Workaround SQM/PSE stalls by disabling sticky NIX SQ manager sticky mode is known to cause stalls when multiple SQs share an SMQ and transmit concurrently. Additionally, PSE may deadlock on transitions between sticky and non-sticky transmissions. There is also a credit drop issue observed when certain condition clocks are gated. work around these hardware errata by: - Disabling SQM sticky operation: - Clear TM6 (bit 15) - Clear TM11 (bit 14) - Disabling sticky → non-sticky transition path that can deadlock PSE: - Clear TM5 (bit 23) - Preventing credit drops by keeping the control-flow clock enabled: - Set TM9 (bit 21) These changes are applied via NIX_AF_SQM_DBG_CTL_STATUS. With this configuration the SQM/PSE maintain forward progress under load without credit loss, at the cost of disabling sticky optimizations.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < 9a3fd301329474f449e75f86d8a4f6b9c603fd6c (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < d0b3c8a80336029d9356f429151eb27922d80a3c (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < 36cc5a5e0178d5fb79e04173b8aa623b0108819a (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < d9b549b6951ba178ec14339a031cae65f4e43fe1 (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < cec2ceb35ce7bc874c43812bb39200d6cf691b87 (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < 8052d0587fb14b85539c3a14a226586c0c3d6b4c (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < b7eba260a34e854e2487b8363c11976f082df00d (git)
Affected: 5d9b976d4480dc0dcfa3719b645636d2f0f9f156 , < 70e9a5760abfb6338d63994d4de6b0778ec795d6 (git)
Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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              "value": "AV:N - An unauthenticated remote peer can induce ordinary transmit traffic through the OcteonTX2 NIC by sending network requests or packets that cause kernel/server responses. The affected condition is in the network transmit hardware path after driver initialization.\nAC:L - The stall/deadlock condition requires concurrent transmission from multiple SQs sharing an SMQ, which is a normal multi-queue configuration on multicore systems and can be driven with parallel network traffic. No attacker-uncontrollable race or rare configuration is required beyond having affected hardware.\nPR:N - The attacker does not need local privileges or administrative access to the host; network traffic that causes transmit responses is sufficient in a reasonable server deployment. Driver initialization/configuration is privileged, but the vulnerable runtime condition is reachable through normal packet transmission.\nUI:N - No victim user action is required after the affected system is running. The attacker can trigger transmit load remotely.\nS:U - The impact remains within the same kernel/device security authority. This is not a guest-to-host escape, IOMMU bypass, or cross-scope boundary violation.\nC:N - The bug is a hardware forward-progress erratum involving SQM/PSE stalls, deadlock, and credit loss. The fix does not indicate exposure of memory or packet contents.\nI:N - The issue does not provide an attacker with a write primitive or data modification capability. It affects transmit progress/credits rather than protected data integrity.\nA:H - The erratum can stall SQs or deadlock PSE under concurrent transmit load, causing loss of network transmit availability for the affected interface/device. Repeated remote traffic can sustain a denial of service."
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With this\\nconfiguration the SQM/PSE maintain forward progress under load without\\ncredit loss, at the cost of disabling sticky 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:37:26+00:00",
      "cve": "CVE-2026-43296",
      "id": "CVE-2026-43296",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: octeontx2-af: Workaround SQM/PSE stalls by disabling sticky",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43296.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:12:01Z",
      "cve": "CVE-2026-43296",
      "id": "CVE-2026-43296",
      "initial_release_date": "2026-05-12T03:31:09Z",
      "product_status:known_affected": "512",
      "product_status:known_not_affected": "106",
      "product_status:recommended": "122",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43296",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43296.json",
      "version": "10"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.