{"id":"CVE-2021-46905","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-46905","generatedAt":"2026-10-27T20:54:30.424Z","title":"In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 (\"net: hso: fix null-ptr-deref during tty device unregistration\") fixed the racy minor allocation reported by…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hso: fix NULL-deref on disconnect regression\n\nCommit 8a12f8836145 (\"net: hso: fix null-ptr-deref during tty device\nunregistration\") fixed the racy minor allocation reported by syzbot, but\nintroduced an unconditional NULL-pointer dereference on every disconnect\ninstead.\n\nSpecifically, the serial device table must no longer be accessed after\nthe minor has been released by hso_serial_tty_unregister().","published":"2024-02-26T16:27:45.000Z","lastModified":"2026-06-17T04:15:48.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["linux/linux kernel"],"epss":{"score":0.00261,"percentile":0.17714,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5871761c5f0f20d6e98bf3b6bd7486d857589554","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/5871761c5f0f20d6e98bf3b6bd7486d857589554","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-46905","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}