{"id":"CVE-2026-80802","title":"nfc: fdp: bound the device-reported read length and fix an skb leak","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 1fc32327b927a6e2cde086f82575c29880844228","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 8d2c243b79854628ff076c38748c020042f02f57","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 0d723090645b82c1cb27cfd7ebf81f0e7c96bcae","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < db7e464b350969c6ea8340de00d9796e5fd5123b","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < e5eec121f2c3bc4c7022613bedd9121a8aa4c949","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 1aa3fc769b0c45bd19f8dab1697084c2b3f6d706","Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1","Linux 4.4"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:55.498Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80802","references":[{"url":"https://git.kernel.org/stable/c/d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee"},{"url":"https://git.kernel.org/stable/c/1fc32327b927a6e2cde086f82575c29880844228"},{"url":"https://git.kernel.org/stable/c/8d2c243b79854628ff076c38748c020042f02f57"},{"url":"https://git.kernel.org/stable/c/fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463"},{"url":"https://git.kernel.org/stable/c/0d723090645b82c1cb27cfd7ebf81f0e7c96bcae"},{"url":"https://git.kernel.org/stable/c/db7e464b350969c6ea8340de00d9796e5fd5123b"},{"url":"https://git.kernel.org/stable/c/e5eec121f2c3bc4c7022613bedd9121a8aa4c949"},{"url":"https://git.kernel.org/stable/c/1aa3fc769b0c45bd19f8dab1697084c2b3f6d706"},{"url":"https://git.kernel.org/stable/c/7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1"}],"tags":["cve.org"],"epss":0.00243,"epssPercentile":0.1438,"ingestedAt":"2026-10-19T09:16:01.526Z","slug":"CVE-2026-80802","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 1fc32327b927a6e2cde086f82575c29880844228`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 8d2c243b79854628ff076c38748c020042f02f57`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 0d723090645b82c1cb27cfd7ebf81f0e7c96bcae`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < db7e464b350969c6ea8340de00d9796e5fd5123b`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < e5eec121f2c3bc4c7022613bedd9121a8aa4c949`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 1aa3fc769b0c45bd19f8dab1697084c2b3f6d706`\n- `Linux >= a06347c04c13e380afce0c9816df51f00b83faf1 < 7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1`\n- `Linux 4.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}