CVE-2025-39716 - parisc: Revise __get_user() to probe user read access

CVE-2025-39716 - parisc: Revise __get_user() to probe user read access

https://cvefeed.io/rssfeed/latest.atom / Fri, 09/05/2025 - 20:38
CVE ID : CVE-2025-39716
Published : Sept. 5, 2025, 5:21 p.m. | 52 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: parisc: Revise __get_user() to probe user read access Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel executes at privilege level 0, so __get_user() never triggers a read access interruption (code 26). Thus, it is currently possible for user code to access a read protected address via a system call. Fix this by probing read access rights at privilege level 3 (PRIV_USER) and setting __gu_err to -EFAULT (-14) if access isn't allowed. Note the cmpiclr instruction does a 32-bit compare because COND macro doesn't work inside asm.
Severity: 0.0 | NA
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