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Vulnerability record · CVE-2026-64082 · published 19 July 2026

CVE-2026-64082: Linux kernel use of uninitialized resource vulnerability

Linux · Linux Kernel

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. Since cregs is an uninitialized stack variable, a copyin failure causes uninitialized stack data to be written into the target task's pt_regs, corrupting its register state and potentially leaking kernel stack contents. compat_restore_sigcontext() has the same issue: it calls cregs_to_regs() even when __copy_from_user() fails, leading to the same corruption of the signal-returning task's register state on error. Only call cregs_to_regs() when the user copy succeeds.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-908 · Use of uninitialized resource
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
3 Sep 2026Last modified by NVD

Description

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. Since cregs is an uninitialized stack variable, a copyin failure causes uninitialized stack data to be written into the target task's pt_regs, corrupting its register state and potentially leaking kernel stack contents. compat_restore_sigcontext() has the same issue: it calls cregs_to_regs() even when __copy_from_user() fails, leading to the same corruption of the signal-returning task's register state on error. Only call cregs_to_regs() when the user copy succeeds.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0599aa23734c48de9bce36d043a9ec90c23945a1 Patch
https://git.kernel.org/stable/c/2a7d1daf2674fe7d5b1cc99a4e3b5f0f72d5958f Patch
https://git.kernel.org/stable/c/66dedb6028c3df6c6a3372dd935b823917e150d5 Patch
https://git.kernel.org/stable/c/6ebcbb53fc9bc30843054ed99fd60b8e542628f4 Patch
https://git.kernel.org/stable/c/9e020156833f1ad0d425a1e3d85b65639f1c1c50 Patch
https://git.kernel.org/stable/c/f2d88b0d7aebfa4643fc58bbae57210c6daff9c6 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64082), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.