CVE-2025-38733s390/mm: Do not map lowcore with identity mapping
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: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once. This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 32db401965f165f7c44447d0508097f070c8f576 builds before 30bf5728bb217a6d1ba73f44094c9b9c6bc9a567; 32db401965f165f7c44447d0508097f070c8f576 builds before 1d7864acd497cb468a998d44631f84896f885e85; from 32db401965f165f7c44447d0508097f070c8f576 before 93f616ff870a1fb7e84d472cad0af651b18f9f87; 0b99d0e17d6a73a0526f92bc6b54b2b95e67a31d; from 6.10.11 before 6.11 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.10.11 before 6.11; from 6.11.1 before 6.12.44; from 6.13 before 6.16.4; 6.11; 6.11; 6.11; 6.11; 6.17; and 1 more ranges | NVD |
References
- https://git.kernel.org/stable/c/30bf5728bb217a6d1ba73f44094c9b9c6bc9a567patch
- https://git.kernel.org/stable/c/1d7864acd497cb468a998d44631f84896f885e85patch
- https://git.kernel.org/stable/c/93f616ff870a1fb7e84d472cad0af651b18f9f87patch
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.