{"id":"CVE-2026-31660","summary":"nfc: pn533: allocate rx skb before consuming bytes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: pn533: allocate rx skb before consuming bytes\n\npn532_receive_buf() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already hand\na complete frame to pn533_recv_frame() before allocating a fresh receive\nbuffer.\n\nIf that alloc_skb() fails, the callback returns 0 even though it has\nalready consumed bytes, and it leaves recv_skb as NULL for the next\nreceive callback. That breaks the receive_buf() accounting contract and\ncan also lead to a NULL dereference on the next skb_put_u8().\n\nAllocate the receive skb lazily before consuming the next byte instead.\nIf allocation fails, return the number of bytes already accepted.","modified":"2026-07-08T08:00:10.332391057Z","published":"2026-04-24T14:45:11.039Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31660.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07cb6c72e66ba548679f22ac29ad588da8999279"},{"type":"WEB","url":"https://git.kernel.org/stable/c/16649adc2e19509104245ea1f349b629d858f11f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/21ae2cda66a55c759607bbf1d23cbaa42019d2de"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7e37da42eda45d7859d9273fc7e225d8df458038"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b71299d587d9e4c830c18afb884c80ddb30ad28"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9495069b43b8634c1ae0042e888766c34f66637"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c71ba669b570c7b3f86ec875be222ea11dacb352"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31660.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31660"},{"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":"c656aa4c27b17a8c70da223ed5ab42145800d6b5"},{"fixed":"2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb"},{"fixed":"8b71299d587d9e4c830c18afb884c80ddb30ad28"},{"fixed":"16649adc2e19509104245ea1f349b629d858f11f"},{"fixed":"07cb6c72e66ba548679f22ac29ad588da8999279"},{"fixed":"a9495069b43b8634c1ae0042e888766c34f66637"},{"fixed":"21ae2cda66a55c759607bbf1d23cbaa42019d2de"},{"fixed":"7e37da42eda45d7859d9273fc7e225d8df458038"},{"fixed":"c71ba669b570c7b3f86ec875be222ea11dacb352"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31660.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.169"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.135"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.82"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.23"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31660.json"}}],"schema_version":"1.7.5"}