CVE-2026-43120high

RDMA/irdma: Fix double free related to rereg_user_mr

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.1%

exploitation probability

0.1%top 98% of all CVEs

observed exploitation

nono source reports it

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix double free related to rereg_user_mr If IB_MR_REREG_TRANS is set during rereg_user_mr, the umem will be released and a new one will be allocated in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans fails after the new umem is allocated, it releases the umem, but does not set iwmr->region to NULL. The problem is that this failure is propagated to the user, who will then call ibv_dereg_mr (as they should). Then, the dereg_mr path will see a non-NULL umem and attempt to call ib_umem_release again. Fix this by setting iwmr->region to NULL after ib_umem_release. Fixed: 5ac388db27c4 ("RDMA/irdma: Add support to re-register a memory region")

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/0c5d70bcb9d2275a1c8515a924016fcfeb4ab441 https://git.kernel.org/stable/c/0f22c32141acdcda266b26cab2b830baf870f3e0 https://git.kernel.org/stable/c/29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2 https://git.kernel.org/stable/c/62298a48f8b8788ad8b8464e6ffdf1ddebd2217e https://git.kernel.org/stable/c/66964118f1f50ed85001c8fc9f7ab5bbdd021ee0