5.5

CVE-2024-26840

cachefiles: fix memory leak in cachefiles_add_cache()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.30 < 4.19.309
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.271
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.212
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.151
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.80
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.19
Linux ≫ Linux Kernel Version >= 6.7 < 6.7.7
Linux ≫ Linux Kernel Version6.8 Updaterc1
Linux ≫ Linux Kernel Version6.8 Updaterc2
Linux ≫ Linux Kernel Version6.8 Updaterc3
Linux ≫ Linux Kernel Version6.8 Updaterc4
Linux ≫ Linux Kernel Version6.8 Updaterc5
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.194
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-401 Missing Release of Memory after Effective Lifetime

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Mailing List
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Mailing List
https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285
Patch
https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3
Patch
https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8
Patch
https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58
Patch
https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579
Patch
https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a
Patch
https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083
Patch
https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444
Patch