{"cve":"CVE-2026-80980","nvd":{"published":"2026-09-11T20:19:04.407","modified":"2026-10-21T13:20:02.207","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: stop killed, freed and out_of_sync sharing a byte\n\nThe three connection state flags are single-bit bitfields, so they occupy\none byte of struct smc_connection and every store to one is a\nread-modify-write of the other two:\n\n    u8  killed : 1;\n    u8  freed : 1;\n    u8  out_of_sync : 1;\n\nThey are not written under a common lock. smc_cdc_msg_validate() sets\nout_of_sync from the receive tasklet, while smc_conn_kill() sets killed\nfrom process context under lock_sock(), and the receive path does not defer\nto the backlog when the socket is owned -- smc_cdc_msg_recv() takes only\nbh_lock_sock().\n\nGive each flag its own byte so a store no longer touches its neighbours.\nAll readers test them as booleans and are unchanged. struct smc_connection\ngrows by two bytes.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a","https://git.kernel.org/stable/c/297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b","https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec","https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9","https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-80980","score":0.00635,"percentile":0.50124,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}