CVE-2025-39698

MEDIUM EPSS 7.6%
Published Sep 5, 20259mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/futex: ensure io_futex_wait() cleans up properly on failure The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.

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
7.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-416 Use After Free Memory Safety
CWE-672

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥6.7  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/508c1314b342b78591f51c4b5dadee31a88335df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d34c04152df517c59979b4bf2a47f491e06d3256
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d9f93172820a53ab42c4b0e5e65291f4f9d00ad2
    Patch
  • zerodayinitiative.com https://www.zerodayinitiative.com/advisories/ZDI-25-915/
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/508c1314b342b78591f51c4b5dadee31a88335df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d34c04152df517c59979b4bf2a47f491e06d3256
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d9f93172820a53ab42c4b0e5e65291f4f9d00ad2
    Patch