{"id":"CVE-2026-80980","title":"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 …","summary":"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 …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-366"],"vendor":"Linux","product":"Linux","affected":["Linux >= b286a0651e4404ab96cdfdcdad8a839a26b3751e < 09a9cbadc05f452405de31012bd2c428b601291a","Linux >= b286a0651e4404ab96cdfdcdad8a839a26b3751e < 313f79149eb337411c64e2c247234b62ef9a3cb9","Linux >= b286a0651e4404ab96cdfdcdad8a839a26b3751e < 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec","Linux >= b286a0651e4404ab96cdfdcdad8a839a26b3751e < db51a8658c11a82432b64999519a269c3aabb447","Linux 5.8"],"published":"2026-09-11","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:41.440","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80980","references":[{"url":"https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80980.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80980"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532124"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80980"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80980"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80980.mbox"},{"url":"https://git.kernel.org/stable/c/297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00635,"epssPercentile":0.50213,"scores":{"nvd":9.8,"vendor":5.5,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.476Z","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:21:47.866329Z"},"slug":"CVE-2026-80980","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80980.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":215287,"id":"CVE-2026-80980","ts":1791027880410,"field":"cvss","old":"5.5","new":"9.8"},{"seq":215286,"id":"CVE-2026-80980","ts":1791027880410,"field":"severity","old":"medium","new":"critical"},{"seq":204177,"id":"CVE-2026-80980","ts":1789490236483,"field":"cvss","old":"4.8","new":"5.5"},{"seq":202929,"id":"CVE-2026-80980","ts":1789403732991,"field":"cvss","old":"9.8","new":"4.8"},{"seq":202928,"id":"CVE-2026-80980","ts":1789403732991,"field":"severity","old":"critical","new":"medium"},{"seq":183596,"id":"CVE-2026-80980","ts":1789356676036,"field":"cvss","old":"9.8","new":"4.8"},{"seq":183595,"id":"CVE-2026-80980","ts":1789356676036,"field":"severity","old":"critical","new":"medium"},{"seq":153164,"id":"CVE-2026-80980","ts":1789285349365,"field":"cvss","old":null,"new":"9.8"},{"seq":153163,"id":"CVE-2026-80980","ts":1789285349365,"field":"severity","old":"none","new":"critical"},{"seq":147738,"id":"CVE-2026-80980","ts":1789270212099,"field":"cvss","old":null,"new":"4.8"},{"seq":147737,"id":"CVE-2026-80980","ts":1789270212099,"field":"severity","old":"none","new":"medium"},{"seq":109496,"id":"CVE-2026-80980","ts":1789183732138,"field":"cvss","old":null,"new":"4.8"},{"seq":109495,"id":"CVE-2026-80980","ts":1789183732138,"field":"severity","old":"none","new":"medium"}]}