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    CVE-2020-25212

    A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.

    Published:Sep 9, 2020
    Last Modified:Nov 21, 2024
    EPS:Sep 9, 2020
    EPSS Score:0.00032
    CVSS Score:7

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Extras Rt
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    References

    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
    https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21
    https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
    https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
    https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
    https://twitter.com/grsecurity/status/1303370421958578179
    https://usn.ubuntu.com/4525-1/
    https://usn.ubuntu.com/4527-1/
    https://usn.ubuntu.com/4578-1/
    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
    http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
    https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21
    https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
    https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
    https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
    https://twitter.com/grsecurity/status/1303370421958578179
    https://usn.ubuntu.com/4525-1/
    https://usn.ubuntu.com/4527-1/
    https://usn.ubuntu.com/4578-1/

    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