High 7.8Published Jun 19, 2026

CVE-2026-52908RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

Updated under an hour ago (Oct 27, 2026, 9:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-285
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b40656aa7d559adc1fe689396dc58b92a9a27286 before 09dc18894148381d3bfc550083b1236043870dce; from b40656aa7d559adc1fe689396dc58b92a9a27286 before eba5df21eda0fe7418efbea2f799f8ea1b8ca94c; from b40656aa7d559adc1fe689396dc58b92a9a27286 before 2904e985a2917b5dac65df82733065e78a65fc9d; from b40656aa7d559adc1fe689396dc58b92a9a27286 before 50334a05a950840b39a1ce3d2a173b4183db9b3e; from b40656aa7d559adc1fe689396dc58b92a9a27286 before badad6fad60def1b9805559dd81dbab3d97b82aa	CNA record
linux linux_kernel linux:linux_kernel	from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/09dc18894148381d3bfc550083b1236043870dce	patch
https://git.kernel.org/stable/c/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c	patch
https://git.kernel.org/stable/c/2904e985a2917b5dac65df82733065e78a65fc9d	patch
https://git.kernel.org/stable/c/50334a05a950840b39a1ce3d2a173b4183db9b3e	patch
https://git.kernel.org/stable/c/badad6fad60def1b9805559dd81dbab3d97b82aa	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.