{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "6d4b937251386d9c6f968e7802f0cb16a8523772"
            },
            {
              "fixed": "4ea70146ab9376092297eb8b622ef1792797f2cf"
            },
            {
              "fixed": "a17b345daff46fec4af9f1ecbdf350208016dd15"
            },
            {
              "fixed": "bdfda99c5763822a9a888e8af0ad7d9312ffcfe2"
            },
            {
              "fixed": "4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4"
            },
            {
              "fixed": "2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e"
            },
            {
              "fixed": "00ef529a5402f41eb1d227916437e237450719f9"
            },
            {
              "fixed": "18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "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/2026/89xxx/CVE-2026-89765.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntimers/itimer: Zero-init old itimerval before copy to userspace\n\nOn native sparc64, struct __kernel_old_timeval contains a four-byte hole\nafter tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit.\nput_itimerval() fills only the named fields in a stack-allocated\n__kernel_old_itimerval and copies the entire object to userspace, so\ngetitimer() can expose the two padding holes.\n\nZero-initialize the aggregate before assigning the fields so implicit\npadding is deterministic before it crosses the user/kernel boundary.",
  "id": "CVE-2026-89765",
  "modified": "2026-09-15T03:30:52.165609723Z",
  "published": "2026-09-11T19:47:05.851Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89765.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89765"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "timers/itimer: Zero-init old itimerval before copy to userspace"
}