CVE-2026-43371net: macb: Shuffle the tx ring before enabling tx
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 days later
· 3 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected d89b8b17057e16fad4564c71160e68ca549c1b42 – < c6783bfa31a59f34fe4feb1bdbf67791ef3fb0b7
- affected ec4445ae9e58aed88561d3d1dfa849b039c7782e – < 0a47c3889fcd843c72aa57fa8c4d06f5801fced4
- affected 6e704e89f16fd4a1145756210bc210f14f174f94 – < 88f974fe118cb4653f029929ecbca7cfe06132ae
- affected 316d9fe71fb18bc9b1dba464fdb68dd201315eba – < 58f5d34f88e8f00910b692537f7b2efdb8c3705d
- affected b3a7aa33ca7d46be513fccf832d3540acfe587d0 – < 403182e0771b250cfde0fe7e1081d095ceaf8230
- affected bf9cf80cab81e39701861a42877a28295ade266f – < 881a0263d502e1a93ebc13a78254e9ad19520232
- affected 6.1.165 – < 6.1.167
- affected 6.6.128 – < 6.6.130
- affected 6.12.75 – < 6.12.78
- affected 6.18.16 – < 6.18.20
- affected 6.19.6 – < 6.19.9
References
References6
- https://git.kernel.org/stable/c/c6783bfa31a59f34fe4feb1bdbf67791ef3fb0b7 (opens in a new tab)
- https://git.kernel.org/stable/c/0a47c3889fcd843c72aa57fa8c4d06f5801fced4 (opens in a new tab)
- https://git.kernel.org/stable/c/88f974fe118cb4653f029929ecbca7cfe06132ae (opens in a new tab)
- https://git.kernel.org/stable/c/58f5d34f88e8f00910b692537f7b2efdb8c3705d (opens in a new tab)
- https://git.kernel.org/stable/c/403182e0771b250cfde0fe7e1081d095ceaf8230 (opens in a new tab)
- https://git.kernel.org/stable/c/881a0263d502e1a93ebc13a78254e9ad19520232 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28677 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43371)Record last updated .