CVE-2025-39716parisc: Revise __get_user() to probe user read access
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
- Modified
- Record last updated
- May 12, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 28a9b71671fb4a2993ef85b8ef6f117ea63894fe; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4c981077255acc2ed5b3df6e8dd0125c81b626a9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f410ef9a032caf98117256b22139c31342d7bb06; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 741b163e440683195b8fd4fc8495fcd0105c6ab7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 89f686a0fb6e473a876a9a60a13aec67a62b9a7e | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.13 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 2.6.12; 2.6.12; 2.6.12; 2.6.12; and 1 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/28a9b71671fb4a2993ef85b8ef6f117ea63894fepatch
- https://git.kernel.org/stable/c/4c981077255acc2ed5b3df6e8dd0125c81b626a9patch
- https://git.kernel.org/stable/c/f410ef9a032caf98117256b22139c31342d7bb06patch
- https://git.kernel.org/stable/c/741b163e440683195b8fd4fc8495fcd0105c6ab7patch
- https://git.kernel.org/stable/c/89f686a0fb6e473a876a9a60a13aec67a62b9a7epatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
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.