{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa"
            },
            {
              "fixed": "b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5"
            },
            {
              "fixed": "5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3"
            },
            {
              "fixed": "b74d313567dfc1b7e56629ddbad04e728686f235"
            },
            {
              "fixed": "36cdf5d48ca191dcd71c28cadbe0981b1d25318d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "21f6f41e82e59740e26e06e77bdf58dc7f6f08dd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.66"
            },
            {
              "fixed": "6.7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.10.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80979.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: unregister the connection before draining the rx tasklet\n\nsmc_conn_free() calls smc_ism_unset_conn() only while the link group is\nstill on its device list, and never sets conn-\u003ekilled.\nsmc_lgr_terminate_sched() unlinks the group immediately and defers killing\nits connections to a work item, so a connection freed in that window keeps\nits smcd-\u003econn[] slot with both gates in smcd_handle_irq() open, and the\ndevice can re-arm the receive tasklet after tasklet_kill() has returned. On\nthe DMB-nocopy path the ghost send buffer is freed right after that drain,\nso the re-armed tasklet dereferences it.\n\nUnregister unconditionally and drain before the detach at both teardown\nsites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain.\nClear conn-\u003esndbuf_desc before freeing it as well, so a reader that samples\nthe pointer cannot get one that is already freed.",
  "id": "CVE-2026-80979",
  "modified": "2026-09-13T03:30:53.798031514Z",
  "published": "2026-09-11T19:42:40.171Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36cdf5d48ca191dcd71c28cadbe0981b1d25318d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b74d313567dfc1b7e56629ddbad04e728686f235"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80979.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80979"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/smc: unregister the connection before draining the rx tasklet"
}