CVE-2026-80802

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    CVE-2026-80802

    Published: 4 Sept 2026Last Modified: 15 Sept 2026

    Summary: nfc: fdp: bound the device-reported read length and fix an skb leak

    Details: In the Linux kernel, the following vulnerability has been resolved: nfc: fdp: bound the device-reported read length and fix an skb leak fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization. The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.

    References: https://git.kernel.org/stable/c/0d723090645b82c1cb27cfd7ebf81f0e7c96bcae, https://git.kernel.org/stable/c/1aa3fc769b0c45bd19f8dab1697084c2b3f6d706, https://git.kernel.org/stable/c/1fc32327b927a6e2cde086f82575c29880844228, https://git.kernel.org/stable/c/7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1, https://git.kernel.org/stable/c/8d2c243b79854628ff076c38748c020042f02f57, https://git.kernel.org/stable/c/d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee, https://git.kernel.org/stable/c/db7e464b350969c6ea8340de00d9796e5fd5123b, https://git.kernel.org/stable/c/e5eec121f2c3bc4c7022613bedd9121a8aa4c949, https://git.kernel.org/stable/c/fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80802.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80802, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- a06347c04c13e380afce0c9816df51f00b83faf1
    Fixed -d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee

    Affected versions

    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
    CVE-2026-80802 | CVE-DB