CVE-2026-52908

Summary

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

RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be re-evaluated to ensure it is properly pinned as RW. Since the umem is hidden inside each driver's mr struct add a ib_umem_check_rereg() function that each driver has to call before processing IB_MR_REREG_ACCESS.

mlx4 has to retain its duplicate ib_access_writable check because it implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items in place sequentially while the MR is live, so it will continue to not support this combination.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286 < 09dc18894148381d3bfc550083b1236043870dceaffected
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286 < eba5df21eda0fe7418efbea2f799f8ea1b8ca94caffected
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286 < 2904e985a2917b5dac65df82733065e78a65fc9daffected
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286 < 50334a05a950840b39a1ce3d2a173b4183db9b3eaffected
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286 < badad6fad60def1b9805559dd81dbab3d97b82aaaffected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References