{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47321","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.974Z","datePublished":"2024-05-21T14:35:35.877Z","dateUpdated":"2025-12-18T11:36:36.710Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:36:36.710Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free by calling del_timer_sync()\n\nThis driver's remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver's remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/watchdog/lpc18xx_wdt.c","drivers/watchdog/w83877f_wdt.c"],"versions":[{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"58606882ad8ec6c39e0f40344b922921ef94ab4d","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"ca96b8ea5e74956071154bdb456778cc3027e79f","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"8bec568d7518b1504a602ed5376bb322e4dbb270","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"ecd620e0fb1ff7f78fdb593379b2e6938c99707a","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"db222f1477ad5692cd454709b714949807e5d111","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"4c05dac488a660fe2925c047ecb119e7afaaeb1e","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"1a053c4d716898a53c2e31c574a70ea0c37044a3","status":"affected","versionType":"git"},{"version":"7c25f8c9f67708e6464d2221bc311cbd99e950dc","lessThan":"d0212f095ab56672f6f36aabc605bda205e1e0bf","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/watchdog/lpc18xx_wdt.c","drivers/watchdog/w83877f_wdt.c"],"versions":[{"version":"4.3","status":"affected"},{"version":"0","lessThan":"4.3","status":"unaffected","versionType":"semver"},{"version":"4.4.276","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.276","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.240","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.198","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.134","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.52","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.19","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.4","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"4.4.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"4.9.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"4.14.240"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"4.19.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.4.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.10.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.13.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d"},{"url":"https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f"},{"url":"https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270"},{"url":"https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a"},{"url":"https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111"},{"url":"https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4"},{"url":"https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e"},{"url":"https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3"},{"url":"https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf"}],"title":"watchdog: 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