CVE-2026-80670
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
machine__resolve() accesses env->cpu[al->cpu].socket_id after checking
al->cpu >= 0 and env->cpu != NULL, but without validating al->cpu
against env->nr_cpus_avail. Since al->cpu comes from the untrusted
perf.data sample, a crafted file with a large CPU index causes an
out-of-bounds heap read.
Use perf_env__get_cpu_topology() which validates both NULL and bounds.
Also bounds-check al->cpu before the cast to struct perf_cpu (int16_t):
without this, values like 65536 silently truncate to 0, bypassing the
accessor's internal check and returning CPU 0's topology.
https://git.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8f
https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4
https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4