Low [CVE-2026-64082] Fix register corruption from uninitialized cregs on error
This low-severity 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: Low.
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 does not mean 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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