{"id":"CVE-2026-80802","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:\n\nnfc: fdp: bound the device-reported read length and fix an skb leak\n\nfdp_nci_i2c_read() takes the next packet length from two device-supplied\nbytes and never validates it. The value is a u16 used as the\ni2c_master_recv() count into a 261-byte on-stack buffer: a malicious,\ncounterfeit or malfunctioning controller (or an i2c bus interposer) can\ndrive it far past the buffer for a stack out-of-bounds write that\nclobbers the canary and return address, or below the minimum frame size\n(directly, or by truncating the computed sum) so the header/LRC strip\nand the next length read run past a short receive. Reject a length\noutside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a\ncorrupted packet already is, and force resynchronization.\n\nThe same loop allocates one data skb per iteration and assumes a length\npacket followed by a data packet; a device that sends two data packets\nin one call leaks the first skb when the second allocation overwrites\nit. Free a previously allocated skb before allocating the next.","modified":"2026-09-06T03:46:47.307757511Z","published":"2026-09-04T15:13:16.241Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80802.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d723090645b82c1cb27cfd7ebf81f0e7c96bcae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1aa3fc769b0c45bd19f8dab1697084c2b3f6d706"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1fc32327b927a6e2cde086f82575c29880844228"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d2c243b79854628ff076c38748c020042f02f57"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db7e464b350969c6ea8340de00d9796e5fd5123b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5eec121f2c3bc4c7022613bedd9121a8aa4c949"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80802.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80802"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a06347c04c13e380afce0c9816df51f00b83faf1"},{"fixed":"d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee"},{"fixed":"1fc32327b927a6e2cde086f82575c29880844228"},{"fixed":"8d2c243b79854628ff076c38748c020042f02f57"},{"fixed":"fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463"},{"fixed":"0d723090645b82c1cb27cfd7ebf81f0e7c96bcae"},{"fixed":"db7e464b350969c6ea8340de00d9796e5fd5123b"},{"fixed":"e5eec121f2c3bc4c7022613bedd9121a8aa4c949"},{"fixed":"1aa3fc769b0c45bd19f8dab1697084c2b3f6d706"},{"fixed":"7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80802.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.4.0"},{"fixed":"5.10.267"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.218"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.185"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.154"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.106"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80802.json"}}],"schema_version":"1.9.0"}