CVE-2025-39716
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 2.6.13 | 6.1.149 |
| linux / linux_kernel | 6.2 | 6.6.103 |
| linux / linux_kernel | 6.7 | 6.12.44 |
| linux / linux_kernel | 6.13 | 6.16.4 |
| linux / linux_kernel | 2.6.12 | 2.6.12.x |
| linux / linux_kernel | 2.6.12-rc2 | 2.6.12-rc2.x |
| linux / linux_kernel | 2.6.12-rc3 | 2.6.12-rc3.x |
| linux / linux_kernel | 2.6.12-rc4 | 2.6.12-rc4.x |
| linux / linux_kernel | 2.6.12-rc5 | 2.6.12-rc5.x |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/28a9b71671fb4a2993ef85b8ef6f117ea63894fe
- https://git.kernel.org/stable/c/4c981077255acc2ed5b3df6e8dd0125c81b626a9
- https://git.kernel.org/stable/c/741b163e440683195b8fd4fc8495fcd0105c6ab7
- https://git.kernel.org/stable/c/89f686a0fb6e473a876a9a60a13aec67a62b9a7e
- https://git.kernel.org/stable/c/f410ef9a032caf98117256b22139c31342d7bb06
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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