UBUNTU-CVE-2026-52908

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    UBUNTU-CVE-2026-52908

    Published: 19 Jun 2026Last Modified: 25 Sept 2026
    Upstream:
    CVE-2026-52908
    Aliases:
    USN-8726-1
    USN-8726-2
    USN-8726-3

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-52908, https://www.cve.org/CVERecord?id=CVE-2026-52908, https://git.kernel.org/linus/badad6fad60def1b9805559dd81dbab3d97b82aa, https://ubuntu.com/security/notices/USN-8726-1, https://ubuntu.com/security/notices/USN-8727-1, https://ubuntu.com/security/notices/USN-8728-1, https://ubuntu.com/security/notices/USN-8760-1, https://ubuntu.com/security/notices/USN-8781-1, https://ubuntu.com/security/notices/USN-8726-2, https://ubuntu.com/security/notices/USN-8726-3, https://ubuntu.com/security/notices/USN-8800-1, https://ubuntu.com/security/notices/USN-8760-2, https://ubuntu.com/security/notices/USN-8728-2, https://ubuntu.com/security/notices/USN-8726-4

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-52908 | CVE-DB