CVE-2025-39698

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux194bb58c6090e39bd7d9b9c888a079213628e1f6 < d9f93172820a53ab42c4b0e5e65291f4f9d00ad2affected
LinuxLinux194bb58c6090e39bd7d9b9c888a079213628e1f6 < d34c04152df517c59979b4bf2a47f491e06d3256affected
LinuxLinux194bb58c6090e39bd7d9b9c888a079213628e1f6 < 508c1314b342b78591f51c4b5dadee31a88335dfaffected
LinuxLinux6.7affected
LinuxLinux0 < 6.7unaffected
LinuxLinux6.12.44 <= 6.12.*unaffected
LinuxLinux6.16.4 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References