DEBIAN-CVE-2026-80859

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    DEBIAN-CVE-2026-80859

    Published: 4 Sept 2026Last Modified: 23 Sept 2026
    Upstream:
    CVE-2026-80859

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: fuse: fix missing barrier when checking io-uring readiness fuse_block_alloc() reads fch->initialized and then fch->io_uring. fch->io_uring is set before fch->initialized, ordered by the smp_wmb() in fuse_chan_set_intialized(), but fuse_block_alloc() has no matching read barrier between the two loads. This may lead a CPU to observe fch->initialized=1 but fch->io_uring=0, and skip the check that blocks request allocation until the io-uring queues are ready. This can reintroduce the lock-order inversion deadlock that commit 3393ff964e0f prevents. Add an smp_rmb() barrier to pair with the smp_wmb() in fuse_chan_set_initialized() to prevent this.

    References: https://security-tracker.debian.org/tracker/CVE-2026-80859

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/debian/linux?arch=source&distro=forky

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -7.2.6-1

    Affected versions

    6.12.100-1
    6.12.101-1
    6.12.105-1
    6.12.107-1
    6.12.38-1
    6.12.41-1
    6.12.43-1
    6.12.43-1~bpo12+1
    6.12.48-1
    6.12.57-1
    6.12.57-1~bpo12+1
    6.12.63-1
    6.12.63-1~bpo12+1
    6.12.69-1
    6.12.69-1~bpo12+1
    6.12.73-1
    6.12.73-1~bpo12+1
    6.12.74-1
    6.12.74-2
    6.12.74-2~bpo12+1
    6.12.85-1
    6.12.85-1~bpo12+1
    6.12.86-1
    6.12.86-1~bpo12+1
    6.12.88-1
    6.12.88-1~bpo12+1
    6.12.90-1
    6.12.90-1~bpo12+1
    6.12.90-2
    6.12.90-2~bpo12+1
    6.12.94-1
    6.12.94-1~bpo12+1
    6.12.95-1
    6.12.95-1~bpo12+1
    6.12.96-1

    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
    DEBIAN-CVE-2026-80859 | CVE-DB