Linux kernel RDMA/efa: UAF in admin completion ctx
CVE-2026-31493 Published on April 22, 2026
RDMA/efa: Fix use of completion ctx after free
In the Linux kernel, the following vulnerability has been resolved:
RDMA/efa: Fix use of completion ctx after free
On admin queue completion handling, if the admin command completed with
error we print data from the completion context. The issue is that we
already freed the completion context in polling/interrupts handler which
means we print data from context in an unknown state (it might be
already used again).
Change the admin submission flow so alloc/dealloc of the context will be
symmetric and dealloc will be called after any potential use of the
context.
Products Associated with CVE-2026-31493
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Affected Versions
Linux:- Version 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and below 0dd98aea1c0c45987fa2dd92f988b0eb1a72c125 is affected.
- Version 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and below 1cf95fe5dc5471efea947b4c6f8913da6bc7976e is affected.
- Version 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and below ef3b06742c8a201d0e83edc9a33a89a4fe3009f8 is affected.
- Version 5.12 is affected.
- Before 5.12 is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.