CVE-2024-41012

MEDIUM
Published Jul 23, 2024 Modified Nov 3, 2025 CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: filelock: Remove locks reliably when fcntl/close race is detected When fcntl_setlk() races with close(), it removes the created lock with do_lock_file_wait(). However, LSMs can allow the first do_lock_file_wait() that created the lock while denying the second do_lock_file_wait() that tries to remove the lock. Separately, posix_lock_file() could also fail to remove a lock due to GFP_KERNEL allocation failure (when splitting a range in the middle). After the bug has been triggered, use-after-free reads will occur in lock_get_status() when userspace reads /proc/locks. This can likely be used to read arbitrary kernel memory, but can't corrupt kernel memory. Fix it by calling locks_remove_posix() instead, which is designed to reliably get rid of POSIX locks associated with the given file and files_struct and is also used by filp_flush().

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CVSS v3.1 Score

6.3
MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9 https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22 https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240 https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763 https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224 https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250 https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235 https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3 https://git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9 https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22 https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240 https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763 https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224 https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250 https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235 https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3

Frequently Asked Questions

What is CVE-2024-41012? +
In the Linux kernel, the following vulnerability has been resolved: filelock: Remove locks reliably when fcntl/close race is detected When fcntl_setlk() races with close(), it removes the created lock with do_lock_file_wait(). However, LSMs can allow the first do_lock_file_wait() that created the lock while denying the second do_lock_file_wait() that tries to remove the lock. Separately, posix_lock_file() could also fail to remove a lock due to GFP_KERNEL allocation failure (when splitting a range in the middle). After the bug has been triggered, use-after-free reads will occur in lock_get_status() when userspace reads /proc/locks. This can likely be used to read arbitrary kernel memory, but can't corrupt kernel memory. Fix it by calling locks_remove_posix() instead, which is designed to reliably get rid of POSIX locks associated with the given file and files_struct and is also used by filp_flush(). It has a CVSS v3.1 base score of 6.3 (MEDIUM).
How severe is CVE-2024-41012? +
CVE-2024-41012 has a CVSS v3.1 score of 6.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-41012? +
CVE-2024-41012 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-41012? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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