parisc: Revise gateway LWS calls to probe user read access

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39715
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-05 18:15:48 UTC
Updated2026-05-12 13:17:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: parisc: Revise gateway LWS calls to probe user read access We use load and stbys,e instructions to trigger memory reference interruptions without writing to memory. Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel and gateway page execute at privilege level 0, so this code never triggers a read access interruption. Thus, it is currently possible for user code to execute a LWS compare and swap operation at an address that is read protected at privilege level 3 (PRIV_USER). Fix this by probing read access rights at privilege level 3 and branching to lws_fault if access isn't allowed.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d0585d742ff2d82accd26c661c60a6d260429c4a e8b496c52aa0c6572d88db7cab85aeea6f9c194d git Not specified
CNA Linux Linux affected d0585d742ff2d82accd26c661c60a6d260429c4a 8bccf47adbf658293528e86960e6d6f736b1c9f7 git Not specified
CNA Linux Linux affected d0585d742ff2d82accd26c661c60a6d260429c4a bc0a24c24ceebabb5ba65900e332233d79e625e6 git Not specified
CNA Linux Linux affected d0585d742ff2d82accd26c661c60a6d260429c4a 9b6af875baba9c4679b55f4561e201485451305f git Not specified
CNA Linux Linux affected d0585d742ff2d82accd26c661c60a6d260429c4a f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.44 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.4 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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