Advisory [CVE-2026-64082] Fix register corruption from uninitialized cregs on error
This security Red Hat Linux advisory covers CVE-2026-64082.
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Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: Fix register corruption from uninitialized cregs on error compat_riscv_gpr_set() calls cregs_to_regs() unconditionally, even when user_regset_copyin() fails. Only call cregs_to_regs() when the user copy succeeds.
A flaw was found in the Linux kernel, specifically within the RISC-V architecture's handling of process tracing and signal restoration. When functions like `compat_riscv_gpr_set()` or `compat_restore_sigcontext()` are invoked, they may process uninitialized stack data if a preceding user data copy operation fails.
This can lead to the corruption of a task's register state and potentially leak sensitive kernel stack contents, resulting in information disclosure and a denial of service. Red Hat severity: not rated.
Weakness: CWE-824. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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