cve-2026-64082

HIGH CVSS 7.8 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.

Timeline

Published: 2026-07-19
Last Modified: 2026-09-03

CVSS Details

Attack Vector: LOCAL
Attack Complexity: LOW
Privileges Required: LOW

Affected Products

linux linux_kernel

Weaknesses (CWE)

CWE-908

CVSS metrics

Version	Base	Severity	Vector	Exploitability	Impact	Source
3.1	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	1.8	5.9	416baaa9-dc9f-4396-8d5f-8c081fb06d67

CPE configurations

CPE	Version range	Vulnerable
`cpe:2.3:o:linux:linux_kernel::::::::`	>= 5.19, < 7.0.11	yes
`cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::`	—	yes
`cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::`	—	yes
`cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::`	—	yes

NVD metadata

NVD status: Analyzed
Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

References

Linked Vulnerabilities

No linked vulnerabilities found.

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  "dateUpdated": "2026-09-03T20:03:09.430",
  "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Fix register corruption from uninitialized cregs on error\n\ncompat_riscv_gpr_set() calls cregs_to_regs() unconditionally, even when\nuser_regset_copyin() fails. Since cregs is an uninitialized stack\nvariable, a copyin failure causes uninitialized stack data to be written\ninto the target task's pt_regs, corrupting its register state and\npotentially leaking kernel stack contents.\n\ncompat_restore_sigcontext() has the same issue: it calls cregs_to_regs()\neven when __copy_from_user() fails, leading to the same corruption of\nthe signal-returning task's register state on error.\n\nOnly call cregs_to_regs() when the user copy succeeds.",
  "id": "CVE-2026-64082",
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        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Fix register corruption from uninitialized cregs on error\n\ncompat_riscv_gpr_set() calls cregs_to_regs() unconditionally, even when\nuser_regset_copyin() fails. Since cregs is an uninitialized stack\nvariable, a copyin failure causes uninitialized stack data to be written\ninto the target task's pt_regs, corrupting its register state and\npotentially leaking kernel stack contents.\n\ncompat_restore_sigcontext() has the same issue: it calls cregs_to_regs()\neven when __copy_from_user() fails, leading to the same corruption of\nthe signal-returning task's register state on error.\n\nOnly call cregs_to_regs() when the user copy succeeds."
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  "source": "nvd",
  "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Fix register corruption from uninitialize..."
}

cve-2026-64082

Raw JSON Data