CVE-2025-38733 (GCVE-0-2025-38733)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2025-09-29 05:57
VLAI?
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 32db401965f165f7c44447d0508097f070c8f576 , < 30bf5728bb217a6d1ba73f44094c9b9c6bc9a567 (git)
Affected: 32db401965f165f7c44447d0508097f070c8f576 , < 1d7864acd497cb468a998d44631f84896f885e85 (git)
Affected: 32db401965f165f7c44447d0508097f070c8f576 , < 93f616ff870a1fb7e84d472cad0af651b18f9f87 (git)
Affected: 0b99d0e17d6a73a0526f92bc6b54b2b95e67a31d (git)
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    Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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