7.3

CVE-2025-39694: s390/sclp: Fix SCCB present check

Modified
AliasesUBUNTU-CVE-2025-39694DEBIAN-CVE-2025-39694
Published 05-09-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-39694 is a high (CVSS 7.3) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
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 38 · Related 31
DLA-4328-1DSA-6008-1DSA-6009-1MGASA-2025-0234MGASA-2025-0235OPENSUSE-SU-2025:20081-1

Timeline

  1. 05-09-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/sclp: Fix SCCB present check Tracing code called by the SCLP interrupt handler contains early exits if the SCCB address associated with an interrupt is NULL. This check is performed after physical to virtual address translation. If the kernel identity mapping does not start at address zero, the resulting virtual address is never zero, so that the NULL checks won't work. Subsequently this may result in incorrect accesses to the first page of the identity mapping. Fix this by introducing a function that handles the NULL case before address translation.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% 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

Affected systems

Version check

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

Ubuntu122 products
  • linux< 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 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≥ ada1da31ce34248bc97ca8f801f2cf6efa378a81, < aa5073ac1a2a274812f3b04c278992e68ff67cc7 | ≥ ada1da31ce34248bc97ca8f801f2cf6efa378a81, < 86c2825791c3836a8f77a954b9c5ebe6fab410c5 | ≥ ada1da31ce34248bc97ca8f801f2cf6efa378a81, < 61605c847599fbfdfafe638607841c7d73719081 | ≥ ada1da31ce34248bc97ca8f801f2cf6efa378a81, < bf83ae3537359af088d6577812ed93113dfbcb7b | ≥ ada1da31ce34248bc97ca8f801f2cf6efa378a81, < 430fa71027b6ac9bb0ce5532b8d0676777d4219a | 5.16
  • linux_kernel≥ 5.16, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4 | 6.17:rc1 | 6.17:rc2

3 vendors · 126 products

References

27 links
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