CVE-2026-52908

RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

State: Published
Severity: 7.8 High
Published: Jun 19, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-285 Improper Authorization

Affected Products

Product	Versions
LinuxLinux	b40656aa7d559adc1fe689396dc58b92a9a27286 to before 09dc18894148381d3bfc550083b1236043870dceAffected b40656aa7d559adc1fe689396dc58b92a9a27286 to before eba5df21eda0fe7418efbea2f799f8ea1b8ca94cAffected b40656aa7d559adc1fe689396dc58b92a9a27286 to before 2904e985a2917b5dac65df82733065e78a65fc9dAffected b40656aa7d559adc1fe689396dc58b92a9a27286 to before 50334a05a950840b39a1ce3d2a173b4183db9b3eAffected b40656aa7d559adc1fe689396dc58b92a9a27286 to before badad6fad60def1b9805559dd81dbab3d97b82aaAffected
LinuxLinux	6.2Affected before 6.2Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

b40656aa7d559adc1fe689396dc58b92a9a27286 to before 09dc18894148381d3bfc550083b1236043870dceAffected
b40656aa7d559adc1fe689396dc58b92a9a27286 to before eba5df21eda0fe7418efbea2f799f8ea1b8ca94cAffected
b40656aa7d559adc1fe689396dc58b92a9a27286 to before 2904e985a2917b5dac65df82733065e78a65fc9dAffected
b40656aa7d559adc1fe689396dc58b92a9a27286 to before 50334a05a950840b39a1ce3d2a173b4183db9b3eAffected
b40656aa7d559adc1fe689396dc58b92a9a27286 to before badad6fad60def1b9805559dd81dbab3d97b82aaAffected

LinuxLinux

6.2Affected
before 6.2Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.