CVE-2022-50255

HIGH EPSS 4.5%
Published Sep 15, 20259mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Sep 15, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix reading strings from synthetic events The follow commands caused a crash: # cd /sys/kernel/tracing # echo 's:open char file[]' > dynamic_events # echo 'hist:keys=common_pid:file=filename:onchange($file).trace(open,$file)' > events/syscalls/sys_enter_openat/trigger' # echo 1 > events/synthetic/open/enable BOOM! The problem is that the synthetic event field "char file[]" will read the value given to it as a string without any memory checks to make sure the address is valid. The above example will pass in the user space address and the sythetic event code will happily call strlen() on it and then strscpy() where either one will cause an oops when accessing user space addresses. Use the helper functions from trace_kprobe and trace_eprobe that can read strings safely (and actually succeed when the address is from user space and the memory is mapped in). Now the above can show: packagekitd-1721 [000] ...2. 104.597170: open: file=/usr/lib/rpm/fileattrs/cmake.attr in:imjournal-978 [006] ...2. 104.599642: open: file=/var/lib/rsyslog/imjournal.state.tmp packagekitd-1721 [000] ...2. 104.626308: open: file=/usr/lib/rpm/fileattrs/debuginfo.attr

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥5.10  –  <5.15.75
linuxlinux_kernel*≥5.16  –  <5.19.17
linuxlinux_kernel*≥6.0  –  <6.0.3

References 4

  • git.kernel.org https://git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815
    Patch