Resource Leak Affecting kernel package, versions <0:4.14.343-259.562.amzn2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2-KERNEL-7710733
- published20 Aug 2024
- disclosed17 Apr 2024
Introduced: 17 Apr 2024
CVE-2024-26840 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.343-259.562.amzn2 or higher.
This issue was patched in ALAS2-2024-2549.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26840
- 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://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html