CVE-2026-80602

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Aug 28, 2026
Source updated: Aug 28, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

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.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
f4f925dae7419fc7a10af539c073871927ce3a24	`affected`	git	5be478c1e08981ca91b34de310d7e2638171d9d8	Unavailable	None listed
f4f925dae7419fc7a10af539c073871927ce3a24	`affected`	git	208ecca408b1707ad86ea247d3d3e09d3606fc13	Unavailable	None listed
f4f925dae7419fc7a10af539c073871927ce3a24	`affected`	git	5ab0eba9c8819506bcb72348fd701f8a9006f95e	Unavailable	None listed
f4f925dae7419fc7a10af539c073871927ce3a24	`affected`	git	fb3b76b5ad2ebad63dd76f8b65b624eaf638b73f	Unavailable	None listed
f4f925dae7419fc7a10af539c073871927ce3a24	`affected`	git	2a892294b83f541115c94b0bb637f39bef187657	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.1	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	6.1	Unavailable	None listed
6.6.145	`unaffected`	semver	Unavailable	6.6.*	None listed
6.12.97	`unaffected`	semver	Unavailable	6.12.*	None listed
6.18.40	`unaffected`	semver	Unavailable	6.18.*	None listed
7.1.5	`unaffected`	semver	Unavailable	7.1.*	None listed
7.2	`unaffected`	original_commit_for_fix	Unavailable	*	None listed