AZL-54770
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-54770.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-54770
- Upstream
- Published
- 2024-12-27T15:15:26Z
- Modified
- 2026-04-01T05:18:23.200972Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-56665 affecting package kernel 5.15.200.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
bpf,perf: Fix invalid progarray access in perfeventdetachbpf_prog
Syzbot reported [1] crash that happens for following tracing scenario:
- create tracepoint perf event with attr.inherit=1, attach it to the process and set bpf program to it
attached process forks -> chid creates inherited event
the new child event shares the parent's bpf program and tpevent (hence progarray) which is global for tracepoint
exit both process and its child -> release both events
- first perfeventdetachbpfprog call will release tpevent->progarray and second perfeventdetachbpfprog will crash, because tpevent->progarray is NULL
The fix makes sure the perfeventdetachbpfprog checks prog_array is valid before it tries to remove the bpf program from it.
[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad
- References