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

AI Predicted 4.3 Difficulty: Hard

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinuxb40656aa7d559adc1fe689396dc58b92a9a27286< 09dc18894148381d3bfc550083b1236043870dceaffected
b40656aa7d559adc1fe689396dc58b92a9a27286< eba5df21eda0fe7418efbea2f799f8ea1b8ca94caffected
b40656aa7d559adc1fe689396dc58b92a9a27286< 2904e985a2917b5dac65df82733065e78a65fc9daffected
b40656aa7d559adc1fe689396dc58b92a9a27286< 50334a05a950840b39a1ce3d2a173b4183db9b3eaffected
b40656aa7d559adc1fe689396dc58b92a9a27286< badad6fad60def1b9805559dd81dbab3d97b82aaaffected
6.2affected
< 6.2unaffected
6.6.143≤ 6.6.*unaffected
… +4 more rows
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I. Basic Information for CVE-2026-52908

Vulnerability Information
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Vulnerability Title
RDMA: During rereg_mr ensure that REREG_ACCESS is compatible
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux b40656aa7d559adc1fe689396dc58b92a9a27286 ~ 09dc18894148381d3bfc550083b1236043870dce -
LinuxLinux 6.2 -

II. Public POCs for CVE-2026-52908

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III. Intelligence Information for CVE-2026-52908

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Patches & Fixes for CVE-2026-52908 (5)

Same Patch Batch · Linux · 2026-06-19 · 3 CVEs total

CVE-2026-52910bpf: Free reuseport cBPF prog after RCU grace period.
CVE-2026-52909ip6_vti: set netns_immutable on the fallback device.

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52908

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