CVE-2025-39715

MEDIUM EPSS 3.4%
Published Sep 5, 202510mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥5.17  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
debiandebian_linux11.0any

References 7

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8
    Patch