CVE-2025-39870

Summary

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: Fix double free in idxd_setup_wqs()

The clean up in idxd_setup_wqs() has had a couple bugs because the error handling is a bit subtle. It's simpler to just re-write it in a cleaner way. The issues here are:

  1. If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when "conf_dev" hasn't been initialized.
  2. If kzalloc_node() fails then again "conf_dev" is invalid. It's either uninitialized or it points to the "conf_dev" from the previous iteration so it leads to a double free.

It's better to free partial loop iterations within the loop and then the unwinding at the end can handle whole loop iterations. I also renamed the labels to describe what the goto does and not where the goto was located.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd584acdf54f409cb7eae1359ae6c12aaabedeed8 < 25e6146c2812487a88f619d5ff6efbdcd5b2bc31affected
LinuxLinux47846211998a9ffb0fcc08092eb95ac783d2b11a < df82c7901513fd0fc738052a8e6a330d92cc8ec9affected
LinuxLinux5fcd392dae6d6aba7dc64ffdbb838ff191315da3 < ec5430d090d0b6ace8fefa290fc37e88930017d2affected
LinuxLinux3fd2f4bc010cdfbc07dd21018dc65bd9370eb7a4 < 9f0e225635475b2285b966271d5e82cba74295b1affected
LinuxLinux3fd2f4bc010cdfbc07dd21018dc65bd9370eb7a4 < 39aaa337449e71a41d4813be0226a722827ba606affected
LinuxLinuxed2c66000aa64c0d2621864831f0d04c820a1441affected
LinuxLinux6.1.140 < 6.1.153affected
LinuxLinux6.6.92 < 6.6.107affected
LinuxLinux6.12.30 < 6.12.48affected
LinuxLinux6.14.8 < 6.15affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux6.1.153 <= 6.1.*unaffected
LinuxLinux6.6.107 <= 6.6.*unaffected
LinuxLinux6.12.48 <= 6.12.*unaffected
LinuxLinux6.16.8 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References