CVE-2024-26840: cachefiles: fix memory leak in cachefiles_add_cache()
First published: Wed Apr 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.309 | 4.19.309 |
| redhat/kernel | <5.4.271 | 5.4.271 |
| redhat/kernel | <5.10.212 | 5.10.212 |
| redhat/kernel | <5.15.151 | 5.15.151 |
| redhat/kernel | <6.1.80 | 6.1.80 |
| redhat/kernel | <6.6.19 | 6.6.19 |
| redhat/kernel | <6.7.7 | 6.7.7 |
| redhat/kernel | <6.8 | 6.8 |
| Linux Kernel | >=2.6.30<4.19.309 | |
| Linux Kernel | >=4.20<5.4.271 | |
| Linux Kernel | >=5.5<5.10.212 | |
| Linux Kernel | >=5.11<5.15.151 | |
| Linux Kernel | >=5.16<6.1.80 | |
| Linux Kernel | >=6.2<6.6.19 | |
| Linux Kernel | >=6.7<6.7.7 | |
| Linux Kernel | =6.8-rc1 | |
| Linux Kernel | =6.8-rc2 | |
| Linux Kernel | =6.8-rc3 | |
| Linux Kernel | =6.8-rc4 | |
| Linux Kernel | =6.8-rc5 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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://launchpad.net/bugs/cve/CVE-2024-26840
- https://access.redhat.com/security/cve/CVE-2024-26840
- https://lore.kernel.org/linux-cve-announce/2024041715-CVE-2024-26840-057d@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2275574
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2275573
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26840
- https://nvd.nist.gov/vuln/detail/CVE-2024-26840
- https://security-tracker.debian.org/tracker/CVE-2024-26840
- https://ubuntu.com/security/CVE-2024-26840
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://git.kernel.org/linus/e21a2f17566cbd64926fb8f16323972f7a064444
Frequently Asked Questions
What is the severity of CVE-2024-26840?
CVE-2024-26840 has been categorized as a moderate severity vulnerability due to a memory leak in the Linux kernel cachefiles component.
How do I fix CVE-2024-26840?
To mitigate CVE-2024-26840, upgrade to the fixed versions of the kernel, specifically 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.80, 6.6.19, 6.7.7, or 6.8.
What systems are affected by CVE-2024-26840?
CVE-2024-26840 affects multiple versions of the Linux kernel across various distributions, particularly Red Hat and Debian systems.
What type of vulnerability is CVE-2024-26840?
CVE-2024-26840 is classified as a memory leak vulnerability in the cachefiles component of the Linux kernel.
Is there a workaround for CVE-2024-26840?
While the most effective solution is to upgrade to a patched kernel version, temporary workarounds may involve minimizing the use of cachefiles until a fix is applied.
- agent/title
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2024-26840
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/trending
- agent/references
- agent/last-modified-date
- agent/weakness
- agent/severity
- agent/remedy
- collector/usn-cve
- source/Ubuntu
- agent/description
- agent/event
- agent/source
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup-request
- collector/nvd-api
- agent/tags
- agent/softwarecombine
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/linux
- canonical/linux kernel
- version/linux kernel/2.6.30
- version/linux kernel/4.20
- version/linux kernel/5.5
- version/linux kernel/5.11
- version/linux kernel/5.16
- version/linux kernel/6.2
- version/linux kernel/6.7
- version/linux kernel/6.8-rc1
- version/linux kernel/6.8-rc2
- version/linux kernel/6.8-rc3
- version/linux kernel/6.8-rc4
- version/linux kernel/6.8-rc5
- package-manager/debian