CVE-2026-52908 is a vulnerability in Linux Kernel
Published on June 19, 2026
RDMA: During rereg_mr ensure that REREG_ACCESS is compatible
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.
Products Associated with CVE-2026-52908
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Affected Versions
Linux:- Version b40656aa7d559adc1fe689396dc58b92a9a27286 and below 09dc18894148381d3bfc550083b1236043870dce is affected.
- Version b40656aa7d559adc1fe689396dc58b92a9a27286 and below eba5df21eda0fe7418efbea2f799f8ea1b8ca94c is affected.
- Version b40656aa7d559adc1fe689396dc58b92a9a27286 and below 2904e985a2917b5dac65df82733065e78a65fc9d is affected.
- Version b40656aa7d559adc1fe689396dc58b92a9a27286 and below 50334a05a950840b39a1ce3d2a173b4183db9b3e is affected.
- Version b40656aa7d559adc1fe689396dc58b92a9a27286 and below badad6fad60def1b9805559dd81dbab3d97b82aa is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.