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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-39716

parisc: Revise __get_user() 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 __get_user() to probe user read access Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel executes at privilege level 0, so __get_user() never triggers a read access interruption (code 26). Thus, it is currently possible for user code to access a read protected address via a system call. Fix this by probing read access rights at privilege level 3 (PRIV_USER) and setting __gu_err to -EFAULT (-14) if access isn't allowed. Note the cmpiclr instruction does a 32-bit compare because COND macro doesn't work inside asm.

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

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 28a9b71671fb4a2993ef85b8ef6f117ea63894feaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4c981077255acc2ed5b3df6e8dd0125c81b626a9affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f410ef9a032caf98117256b22139c31342d7bb06affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 741b163e440683195b8fd4fc8495fcd0105c6ab7affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 89f686a0fb6e473a876a9a60a13aec67a62b9a7eaffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 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