Improper Input Validation Affecting perf package, versions <0:6.1.84-99.169.amzn2023
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Improper Input Validation vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-AMZN2023-PERF-8494805
- published11 Dec 2024
- disclosed17 Apr 2024
Introduced: 17 Apr 2024
CVE-2024-26870 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 perf to version 0:6.1.84-99.169.amzn2023 or higher.
This issue was patched in ALAS2023-2024-696.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102
A call to listxattr() with a buffer size = 0 returns the actual size of the buffer needed for a subsequent call. When size > 0, nfs4_listxattr() does not return an error because either generic_listxattr() or nfs4_listxattr_nfs4_label() consumes exactly all the bytes then size is 0 when calling nfs4_listxattr_nfs4_user() which then triggers the following kernel BUG:
[ 99.403778] kernel BUG at mm/usercopy.c:102! [ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1 [ 99.415827] Call trace: [ 99.415985] usercopy_abort+0x70/0xa0 [ 99.416227] __check_heap_object+0x134/0x158 [ 99.416505] check_heap_object+0x150/0x188 [ 99.416696] __check_object_size.part.0+0x78/0x168 [ 99.416886] __check_object_size+0x28/0x40 [ 99.417078] listxattr+0x8c/0x120 [ 99.417252] path_listxattr+0x78/0xe0 [ 99.417476] __arm64_sys_listxattr+0x28/0x40 [ 99.417723] invoke_syscall+0x78/0x100 [ 99.417929] el0_svc_common.constprop.0+0x48/0xf0 [ 99.418186] do_el0_svc+0x24/0x38 [ 99.418376] el0_svc+0x3c/0x110 [ 99.418554] el0t_64_sync_handler+0x120/0x130 [ 99.418788] el0t_64_sync+0x194/0x198 [ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)
Issue is reproduced when generic_listxattr() returns 'system.nfs4_acl', thus calling lisxattr() with size = 16 will trigger the bug.
Add check on nfs4_listxattr() to return ERANGE error when it is called with size > 0 and the return value is greater than size.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26870
- https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb
- https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf
- https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65
- https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b
- https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768
- https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf
- https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html