CVE-2024-26993

MEDIUM
Published May 1, 2024 Modified May 12, 2026

Description

In the Linux kernel, the following vulnerability has been resolved: fs: sysfs: Fix reference leak in sysfs_break_active_protection() The sysfs_break_active_protection() routine has an obvious reference leak in its error path. If the call to kernfs_find_and_get() fails then kn will be NULL, so the companion sysfs_unbreak_active_protection() routine won't get called (and would only cause an access violation by trying to dereference kn->parent if it was called). As a result, the reference to kobj acquired at the start of the function will never be released. Fix the leak by adding an explicit kobject_put() call when kn is NULL.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c https://git.kernel.org/stable/c/57baab0f376bec8f54b0fe6beb8f77a57c228063 https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b https://git.kernel.org/stable/c/84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17 https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4 https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78 https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957 https://git.kernel.org/stable/c/f28bba37fe244889b81bb5c508d3f6e5c6e342c5 https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c https://git.kernel.org/stable/c/57baab0f376bec8f54b0fe6beb8f77a57c228063 https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b https://git.kernel.org/stable/c/84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17 https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4 https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78 https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957 https://git.kernel.org/stable/c/f28bba37fe244889b81bb5c508d3f6e5c6e342c5

Frequently Asked Questions

What is CVE-2024-26993? +
In the Linux kernel, the following vulnerability has been resolved: fs: sysfs: Fix reference leak in sysfs_break_active_protection() The sysfs_break_active_protection() routine has an obvious reference leak in its error path. If the call to kernfs_find_and_get() fails then kn will be NULL, so the companion sysfs_unbreak_active_protection() routine won't get called (and would only cause an access violation by trying to dereference kn->parent if it was called). As a result, the reference to kobj acquired at the start of the function will never be released. Fix the leak by adding an explicit kobject_put() call when kn is NULL. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-26993? +
CVE-2024-26993 has a CVSS v3.1 score of 5.5 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-2024-26993? +
CVE-2024-26993 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-2024-26993? +
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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