CVE-2026-80602

In the Linux kernel, the following vulnerability has been resolved:

perf/x86/amd/lbr: Fix kernel address leakage

A user-only branch stack can contain branches that originate from

the kernel. As a result, kernel addresses are exposed to user space

even when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors

supporting X86_FEATURE_AMD_LBR_V2, perf can still report SYSRET/ERET

entries for which the branch-from addresses are in the kernel.

E.g.

$ perf record -e cycles -o - -j any,save_type,u -- \

perf bench syscall basic --loop 1000 | \

perf script -i - -F brstack|tr ' ' '\n'| \

grep -E '0x[89a-f][0-9a-f]{15}'

...

0xffffffff81001268/0x717a90a38f1a/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a90a39157/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a90a2c628/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a90a41b60/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a90a260db/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a90a260db/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a8bef1c30/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

0xffffffff81001268/0x717a8e4d3c90/M/-/-/0/ERET/NON_SPEC_CORRECT_PATH

...

The reason is that the hardware filter only considers the privilege

level applicable to the branch target. Extend software filtering to

also validate the branch-from addresses against br_sel, so that any

branch record whose branch-from address is in the kernel is dropped

when PERF_SAMPLE_BRANCH_USER is requested.