CVE-2024-26840

MEDIUM
Published Apr 17, 2024 Modified Jan 7, 2025 CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix memory leak in cachefiles_add_cache() The following memory leak was reported after unbinding /dev/cachefiles: ================================================================== unreferenced object 0xffff9b674176e3c0 (size 192): comm "cachefilesd2", pid 680, jiffies 4294881224 hex dump (first 32 bytes): 01 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 00 00 00 00 ................ backtrace (crc ea38a44b): [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370 [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0 [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120 [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0 [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0 [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520 [<ffffffff8ebc5069>] ksys_write+0x69/0xf0 [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140 [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 ================================================================== Put the reference count of cache_cred in cachefiles_daemon_unbind() to fix the problem. And also put cache_cred in cachefiles_add_cache() error branch to avoid memory leaks.

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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

Weakness Type (CWE)

CWE-401 CWE-401

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

References

Advisories & Patches

https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285 https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3 https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8 https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58 https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579 https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083 https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444 https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285 https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3 https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8 https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58 https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579 https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083 https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444

Frequently Asked Questions

What is CVE-2024-26840? +
In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix memory leak in cachefiles_add_cache() The following memory leak was reported after unbinding /dev/cachefiles: ================================================================== unreferenced object 0xffff9b674176e3c0 (size 192): comm "cachefilesd2", pid 680, jiffies 4294881224 hex dump (first 32 bytes): 01 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 00 00 00 00 ................ backtrace (crc ea38a44b): [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370 [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0 [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120 [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0 [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0 [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520 [<ffffffff8ebc5069>] ksys_write+0x69/0xf0 [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140 [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 ================================================================== Put the reference count of cache_cred in cachefiles_daemon_unbind() to fix the problem. And also put cache_cred in cachefiles_add_cache() error branch to avoid memory leaks. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-26840? +
CVE-2024-26840 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-2024-26840? +
CVE-2024-26840 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-2024-26840? +
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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