CVE-2024-26840

cachefiles: fix memory leak in cachefiles_add_cache()

MEDIUM

5.5

CVSS Score

Published: April 17, 2024 at 10:10 AM UTC

Updated: June 17, 2026 at 07:18 AM UTC

1 product affected across 1 vendorLinux Kernel

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.30 ≤ v < 4.19.3092.6.30 ≤ v < 5.10.2122.6.30 ≤ v < 5.15.1512.6.30 ≤ v < 5.4.2712.6.30 ≤ v < 6.1.802.6.30 ≤ v < 6.6.192.6.30 ≤ v < 6.7.72.6.30 ≤ v < 6.84.20 ≤ v < 5.4.2715.11 ≤ v < 5.15.1515.16 ≤ v < 6.1.805.5 ≤ v < 5.10.2126.2 ≤ v < 6.6.196.7 ≤ v < 6.7.76.8 rc1 6.8 rc2 6.8 rc3 6.8 rc4 6.8 rc59ae326a69004dea8af2dae4fde58de27db700a8d

Vendor states this is fixed in 037d5a949b0455540ef9aab34c10ddf54b65d285 (fixed)

Vendor states this is fixed in 38e921616320d159336b0ffadb09e9fb4945c7c3 (fixed)

Vendor states this is fixed in 43eccc5823732ba6daab2511ed32dfc545a666d8 (fixed)

Vendor states this is fixed in 8b218e2f0a27a9f09428b1847b4580640b9d1e58 (fixed)

Vendor states this is fixed in 94965be37add0983672e48ecb33cdbda92b62579 (fixed)

Vendor states this is fixed in 9cac69912052a4def571fedf1cb9bb4ec590e25a (fixed)

Vendor states this is fixed in cb5466783793e66272624cf71925ae1d1ba32083 (fixed)

Vendor states this is fixed in e21a2f17566cbd64926fb8f16323972f7a064444 (fixed)

Vendor states this is fixed in 2.6.30 (unaffected)

Vendor states this is fixed in 4.19.309 (unaffected)

Vendor states this is fixed in 5.10.212 (unaffected)

Vendor states this is fixed in 5.15.151 (unaffected)