CVE-2022-48713 perf/x86/intel/pt: Fix crash with stop filters in single-range mode
A local attacker can crash the Linux kernel by triggering a null pointer dereference in Intel PT tracing when using stop filters in single-range mode.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-48713?
CVE-2022-48713 is a medium-severity vulnerability in Linux kernel, published on 20 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/pt: Fix crash with stop filters in single-range mode
Add a check for !buf->single before calling pt_buffer_region_size in a place where a missing check can cause a kernel crash.
Fixes a bug introduced by commit 670638477aed ("perf/x86/intel/pt: Opportunistically use single range output mode"), which added a support for PT single-range output mode. Since that commit if a PT stop filter range is hit while tracing, the kernel will crash because of a null pointer dereference in pt_handle_status due to calling pt_buffer_region_size without a ToPA configured.
The commit which introduced single-range mode guarded almost all uses of the ToPA buffer variables with checks of the buf->single variable, but missed the case where tracing was stopped by the PT hardware, which happens when execution hits a configured stop filter.
Tested that hitting a stop filter while PT recording successfully records a trace with this patch but crashes without this patch.
Weakness: CWE-476
Which versions are affected by CVE-2022-48713?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48713?
Apply the vendor's patch.
Is CVE-2022-48713 being exploited?
There is no known exploitation of CVE-2022-48713 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48713, GHSA-cfrf-95q8-jrvm, UBUNTU-CVE-2022-48713.