{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47356","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.987Z","datePublished":"2024-05-21T14:35:59.097Z","dateUpdated":"2025-12-18T11:37:10.140Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:37:10.140Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: fix possible use-after-free in HFC_cleanup()\n\nThis module'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/isdn/hardware/mISDN/hfcpci.c"],"versions":[{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"54ff3202928952a100c477248e65ac6db01258a7","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"7867ddc5f3de7f289aee63233afc0df4b62834c5","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"5f2818185da0fe82a932f0856633038b66faf124","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"3ecd228c636ee17c14662729737fa07242a93cb0","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"61370ff07e0acc657559a8fac02551dfeb9d3020","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda","status":"affected","versionType":"git"},{"version":"87c5fa1bb42624254a2013cbbc3b170d6017f5d6","lessThan":"009fc857c5f6fda81f2f7dd851b2d54193a8e733","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/isdn/hardware/mISDN/hfcpci.c"],"versions":[{"version":"2.6.29","status":"affected"},{"version":"0","lessThan":"2.6.29","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":"5.4.133","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.51","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.18","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.3","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":"2.6.29","versionEndExcluding":"4.4.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.9.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.14.240"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"4.19.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.4.133"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.12.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"},{"url":"https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"},{"url":"https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5"},{"url":"https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"},{"url":"https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"},{"url":"https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"},{"url":"https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"},{"url":"https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"},{"url":"https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"}],"title":"mISDN: 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