7.8

CVE-2025-68179: s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP

Deferred
AliasesUBUNTU-CVE-2025-68179DEBIAN-CVE-2025-68179
Published 16-12-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-68179 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
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 31 · Related 28
MGASA-2026-0017MGASA-2026-0018OPENSUSE-SU-2026:21555-1RHSA-2025:6966SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1

Timeline

  1. 16-12-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP As reported by Luiz Capitulino enabling HVO on s390 leads to reproducible crashes. The problem is that kernel page tables are modified without flushing corresponding TLB entries. Even if it looks like the empty flush_tlb_all() implementation on s390 is the problem, it is actually a different problem: on s390 it is not allowed to replace an active/valid page table entry with another valid page table entry without the detour over an invalid entry. A direct replacement may lead to random crashes and/or data corruption. In order to invalidate an entry special instructions have to be used (e.g. ipte or idte). Alternatively there are also special instructions available which allow to replace a valid entry with a different valid entry (e.g. crdte or cspg). Given that the HVO code currently does not provide the hooks to allow for an implementation which is compliant with the s390 architecture requirements, disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, which is basically a revert of the original patch which enabled it.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

5%

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.

Ubuntu127 products
  • linux< 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.12.63-1 | < 6.17.8-1
Linux1 product
  • linux≥ 00a34d5a99c0631bd780b14cbe3813d0b39c3886, < 7088465f10816d9425b95740b37c95f082041d76 | ≥ 00a34d5a99c0631bd780b14cbe3813d0b39c3886, < 5e23918e4352288323d13fb511116cdea0234b71 | ≥ 00a34d5a99c0631bd780b14cbe3813d0b39c3886, < d4a8238e5729505b7394ccb007e5dc3e557aa66b | ≥ 00a34d5a99c0631bd780b14cbe3813d0b39c3886, < 64e2f60f355e556337fcffe80b9bcff1b22c9c42 | 6.2

3 vendors · 129 products

References

23 links
Show all 23 references