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CVE-2025-39716 (GCVE-0-2025-39716)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-05-12 12:06
VLAI
Title
parisc: Revise __get_user() to probe user read access
Summary
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28a9b71671fb4a2993ef85b8ef6f117ea63894fe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4c981077255acc2ed5b3df6e8dd0125c81b626a9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f410ef9a032caf98117256b22139c31342d7bb06 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 741b163e440683195b8fd4fc8495fcd0105c6ab7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89f686a0fb6e473a876a9a60a13aec67a62b9a7e (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
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}



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