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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-39715

parisc: Revise gateway LWS calls to probe user read access

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d0585d742ff2d82accd26c661c60a6d260429c4a to < e8b496c52aa0c6572d88db7cab85aeea6f9c194daffected
  • d0585d742ff2d82accd26c661c60a6d260429c4a to < 8bccf47adbf658293528e86960e6d6f736b1c9f7affected
  • d0585d742ff2d82accd26c661c60a6d260429c4a to < bc0a24c24ceebabb5ba65900e332233d79e625e6affected
  • d0585d742ff2d82accd26c661c60a6d260429c4a to < 9b6af875baba9c4679b55f4561e201485451305faffected
  • d0585d742ff2d82accd26c661c60a6d260429c4a to < f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8affected

Linux Linux

Default version status: affected

  • 5.17affected
  • 0 to < 5.17unaffected
  • 6.1.149 to ≤ 6.1.*unaffected
  • 6.6.103 to ≤ 6.6.*unaffected
  • 6.12.44 to ≤ 6.12.*unaffected
  • 6.16.4 to ≤ 6.16.*unaffected
  • 6.17 to ≤ *unaffected

References