CVE-2026-97953
CVE CVE-2026-97953EUVD EUVD-2026-86807Published 2026-09-25T10:23:00.000ZLast changed 2026-09-25T14:41:44.000ZCVSS 7.0
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix TX descriptor availability check for TSO traffic stmmac_tso_xmit() estimates the number of free TX descriptors required by a TSO skb as: (skb->len - proto_hdr_len) / TSO_MAX_BUFF_SIZE + 1 which assumes the payload is split into TSO_MAX_BUFF_SIZE chunks. This underestimates the descriptors actually consumed by stmmac_tso_allocator(), since each fragment is mapped individually and so it needs at least one descriptor regardless of its size. Moreover, one descriptor is used for the L2/L3/L4 headers and, when the MSS changes, one more is consumed for the MSS context descriptor. For a highly fragmented TSO skb the check can therefore pass even when the ring has too few free slots. stmmac_tso_allocator() then writes past the available descriptors, overwriting descriptors still owned by the DMA engine, corrupting the TX ring. Add stmmac_tso_get_num_desc() to compute the exact number of descriptors needed for the header, the linear payload and each fragment, plus the MSS context descriptor when required, and use it in the availability check.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux f748be531d7012c456b97f66091d86b3675c5fef <ffa6d2481bc1c87f822ecd626561484e4ee24cef; patch: 7.2.7; patch: 0; f748be531d7012c456b97f66091d86b3675c5fef <65820fc743eae322f7f94f6a64d07861211d4b21; f748be531d7012c456b97f66091d86b3675c5fef <5e38d732ec67a5b1f9a56e6c73add480c4b6030a; 4.7; patch: 7.3-rc3; f748be531d7012c456b97f66091d86b3675c5fef <c28175220f808c867d5618de8ecc6dbcc815c773; patch: 6.12.111; patch: 6.18.53
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.