tracing: Fix reading strings from synthetic events

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50255
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-15 14:15:36 UTC
Updated2026-08-04 10:18:09 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-125

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 d9c79fbcbdb6cb10c07c85040eaf615180b26c48 git Not specified
CNA Linux Linux affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 149198d0b884e4606ed1d29b330c70016d878276 git Not specified
CNA Linux Linux affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 f8bae1853196b52ede50950387f5b48cf83b9815 git Not specified
CNA Linux Linux affected bd82631d7ccdc894af2738e47abcba2cb6e7dea9 0934ae9977c27133449b6dd8c6213970e7eece38 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.15.75 5.15.* semver Not specified
CNA Linux Linux unaffected 5.19.17 5.19.* semver Not specified
CNA Linux Linux unaffected 6.0.3 6.0.* semver Not specified
CNA Linux Linux unaffected 6.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0934ae9977c27133449b6dd8c6213970e7eece38 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d9c79fbcbdb6cb10c07c85040eaf615180b26c48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f8bae1853196b52ede50950387f5b48cf83b9815 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/149198d0b884e4606ed1d29b330c70016d878276 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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