{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "776f395004d829bbbf18c159ed9beb517a208c71"
            },
            {
              "fixed": "388c678639a0cebfd936b3e56c64ac6a371efec2"
            },
            {
              "fixed": "65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a"
            },
            {
              "fixed": "6b20b40f020bde236f6b8a08ff88d8653261ec2b"
            },
            {
              "fixed": "e74a9fa50749b9940b4fb13199652325e08d3c4a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.8.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97993.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx\n\nvhost_vdpa_set_config_call() swaps the eventfd_ctx_fdget() return value\ninto v-\u003econfig_ctx before checking it, so on failure the field briefly\nholds an ERR_PTR:\n\n\tctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);\n\tswap(ctx, v-\u003econfig_ctx);\n\n\tif (!IS_ERR_OR_NULL(ctx))\n\t\teventfd_ctx_put(ctx);\n\n\tif (IS_ERR(v-\u003econfig_ctx)) {\n\t\tlong ret = PTR_ERR(v-\u003econfig_ctx);\n\n\t\tv-\u003econfig_ctx = NULL;\n\t\treturn ret;\n\t}\n\nCommit 0bde59c1723a (\"vhost-vdpa: set v-\u003econfig_ctx to NULL if\neventfd_ctx_fdget() fails\") added that clearing, and spelled out the\ninvariant the rest of the file relies on: \"we consider 'v-\u003econfig_ctx'\nvalid if it is not NULL\".  The window between the swap and the clearing\nstill breaks it.  vhost_vdpa_config_cb() only tests for NULL, so a config\ninterrupt delivered inside the window hands the ERR_PTR to\neventfd_signal().\n\nCheck the fd before installing it instead.  That closes the window and\nmatches how vhost_vring_ioctl() handles the same failure for the vq call\nfd.\n\nIt also stops a rejected fd from tearing down a config interrupt that was\nworking: until now the swap replaced the live context and put it, so\nafter an EBADF the device silently stopped delivering config interrupts\nuntil userspace installed a new fd.",
  "id": "CVE-2026-97993",
  "modified": "2026-09-27T03:30:41.398869606Z",
  "published": "2026-09-25T10:23:25.110Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/388c678639a0cebfd936b3e56c64ac6a371efec2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b20b40f020bde236f6b8a08ff88d8653261ec2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e74a9fa50749b9940b4fb13199652325e08d3c4a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97993.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97993"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx"
}