High 7.8Published Jul 19, 2026

CVE-2026-64082riscv: Fix register corruption from uninitialized cregs on error

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Sep 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7383ee05314be58f8f9f018ee0ac53bef3808aea before f2d88b0d7aebfa4643fc58bbae57210c6daff9c6; 7383ee05314be58f8f9f018ee0ac53bef3808aea builds before 66dedb6028c3df6c6a3372dd935b823917e150d5; 7383ee05314be58f8f9f018ee0ac53bef3808aea builds before 2a7d1daf2674fe7d5b1cc99a4e3b5f0f72d5958f; 7383ee05314be58f8f9f018ee0ac53bef3808aea builds before 0599aa23734c48de9bce36d043a9ec90c23945a1; 7383ee05314be58f8f9f018ee0ac53bef3808aea builds before 9e020156833f1ad0d425a1e3d85b65639f1c1c50; 7383ee05314be58f8f9f018ee0ac53bef3808aea builds before 6ebcbb53fc9bc30843054ed99fd60b8e542628f4	CNA record
linux linux_kernel linux:linux_kernel	from 5.19 before 7.0.11; 7.1; 7.1; 7.1	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.