5.5

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

Modified
AliasesUBUNTU-CVE-2025-39716DEBIAN-CVE-2025-39716
Published 05-09-2025Last modified 12-05-2026

Vulnerability summary

CVE-2025-39716 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 21 · Related 16
DLA-4328-1DSA-6008-1DSA-6009-1MGASA-2025-0234MGASA-2025-0235USN-8028-1

Timeline

  1. 05-09-2025
    PublishedVulnerability first disclosed.
  2. 12-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.15% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu149 products
  • linuxAll versions (No fix recorded) | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.153-1 | < 6.12.48-1 | < 6.16.5-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 28a9b71671fb4a2993ef85b8ef6f117ea63894fe | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4c981077255acc2ed5b3df6e8dd0125c81b626a9 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f410ef9a032caf98117256b22139c31342d7bb06 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 741b163e440683195b8fd4fc8495fcd0105c6ab7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 89f686a0fb6e473a876a9a60a13aec67a62b9a7e | 2.6.12
  • linux_kernel≥ 2.6.13, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5

3 vendors · 153 products

References

28 links
Show all 28 references