CVE-2026-43371 (GCVE-0-2026-43371)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-11 22:23
VLAI
Title
net: macb: Shuffle the tx ring before enabling tx
Summary
In the Linux kernel, the following vulnerability has been resolved: net: macb: Shuffle the tx ring before enabling tx Quanyang observed that when using an NFS rootfs on an AMD ZynqMp board, the rootfs may take an extended time to recover after a suspend. Upon investigation, it was determined that the issue originates from a problem in the macb driver. According to the Zynq UltraScale TRM [1], when transmit is disabled, the transmit buffer queue pointer resets to point to the address specified by the transmit buffer queue base address register. In the current implementation, the code merely resets `queue->tx_head` and `queue->tx_tail` to '0'. This approach presents several issues: - Packets already queued in the tx ring are silently lost, leading to memory leaks since the associated skbs cannot be released. - Concurrent write access to `queue->tx_head` and `queue->tx_tail` may occur from `macb_tx_poll()` or `macb_start_xmit()` when these values are reset to '0'. - The transmission may become stuck on a packet that has already been sent out, with its 'TX_USED' bit set, but has not yet been processed. However, due to the manipulation of 'queue->tx_head' and 'queue->tx_tail', `macb_tx_poll()` incorrectly assumes there are no packets to handle because `queue->tx_head == queue->tx_tail`. This issue is only resolved when a new packet is placed at this position. This is the root cause of the prolonged recovery time observed for the NFS root filesystem. To resolve this issue, shuffle the tx ring and tx skb array so that the first unsent packet is positioned at the start of the tx ring. Additionally, ensure that updates to `queue->tx_head` and `queue->tx_tail` are properly protected with the appropriate lock. [1] https://docs.amd.com/v/u/en-US/ug1085-zynq-ultrascale-trm
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6847 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d89b8b17057e16fad4564c71160e68ca549c1b42 , < c6783bfa31a59f34fe4feb1bdbf67791ef3fb0b7 (git)
Affected: ec4445ae9e58aed88561d3d1dfa849b039c7782e , < 0a47c3889fcd843c72aa57fa8c4d06f5801fced4 (git)
Affected: 6e704e89f16fd4a1145756210bc210f14f174f94 , < 88f974fe118cb4653f029929ecbca7cfe06132ae (git)
Affected: 316d9fe71fb18bc9b1dba464fdb68dd201315eba , < 58f5d34f88e8f00910b692537f7b2efdb8c3705d (git)
Affected: b3a7aa33ca7d46be513fccf832d3540acfe587d0 , < 403182e0771b250cfde0fe7e1081d095ceaf8230 (git)
Affected: bf9cf80cab81e39701861a42877a28295ade266f , < 881a0263d502e1a93ebc13a78254e9ad19520232 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.1.165 , < 6.1.167 (semver)
Affected: 6.6.128 , < 6.6.130 (semver)
Affected: 6.12.75 , < 6.12.78 (semver)
Affected: 6.18.16 , < 6.18.20 (semver)
Affected: 6.19.6 , < 6.19.9 (semver)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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      "cve": "CVE-2026-43371",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: macb: Shuffle the tx ring before enabling tx",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43371.json",
      "version": "3"
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      "cve": "CVE-2026-43371",
      "id": "CVE-2026-43371",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-43371",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43371.json",
      "version": "2"
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  }
}



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  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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