CVE-2025-39715
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 instruct…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 5.17 before 6.1.149 from 6.2 before 6.6.103 from 6.7 before 6.12.44 from 6.13 before 6.16.4 |
| Debian | Debian Linux | Version 11.0 |
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7
- https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f
- https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6
- https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d
- https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html