CVE-2025-68179s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
- 7.8HighCVSS base score
- 0.15%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 95% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 00a34d5a99c0631bd780b14cbe3813d0b39c3886 – < 7088465f10816d9425b95740b37c95f082041d76
- affected 00a34d5a99c0631bd780b14cbe3813d0b39c3886 – < 5e23918e4352288323d13fb511116cdea0234b71
- affected 00a34d5a99c0631bd780b14cbe3813d0b39c3886 – < d4a8238e5729505b7394ccb007e5dc3e557aa66b
- affected 00a34d5a99c0631bd780b14cbe3813d0b39c3886 – < 64e2f60f355e556337fcffe80b9bcff1b22c9c42
- affected 6.2
- unaffected < 6.2
- unaffected 6.6.117 – ≤ 6.6.*
- unaffected 6.12.58 – ≤ 6.12.*
- unaffected 6.17.8 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References4
- https://git.kernel.org/stable/c/7088465f10816d9425b95740b37c95f082041d76 (opens in a new tab)
- https://git.kernel.org/stable/c/5e23918e4352288323d13fb511116cdea0234b71 (opens in a new tab)
- https://git.kernel.org/stable/c/d4a8238e5729505b7394ccb007e5dc3e557aa66b (opens in a new tab)
- https://git.kernel.org/stable/c/64e2f60f355e556337fcffe80b9bcff1b22c9c42 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-203717 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-68179)Record last updated .