{"id":"CVE-2021-47355","state":"PUBLISHED","title":"atm: nicstar: Fix possible use-after-free in nicstar_cleanup()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\natm: nicstar: Fix possible use-after-free in nicstar_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.","publishedAt":"2024-05-21T14:35:58.434Z","updatedAt":"2026-05-11T13:53:06.301Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"99779c9d9ffc7775da6f7fd8a7c93ac61657bed5","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c471569632654e57c83512e0fc1ba0dbb4544ad6","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a7a7b2848312cc4c3a42b6e42a8ab2e441857aba","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"bdf5334250c69fabf555b7322c75249ea7d5f148","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2f958b6f6ba0854b39be748d21dfe71e0fe6580f","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5b991df8881088448cb223e769e37cab8dd40706","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"34e7434ba4e97f4b85c1423a59b2922ba7dff2ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/atm/nicstar.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"4.4.276","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.276","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.240","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.198","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.133","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.51","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.18","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.3","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/atm/nicstar.c"]}],"references":["https://git.kernel.org/stable/c/99779c9d9ffc7775da6f7fd8a7c93ac61657bed5","https://git.kernel.org/stable/c/4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51","https://git.kernel.org/stable/c/c471569632654e57c83512e0fc1ba0dbb4544ad6","https://git.kernel.org/stable/c/a7a7b2848312cc4c3a42b6e42a8ab2e441857aba","https://git.kernel.org/stable/c/bdf5334250c69fabf555b7322c75249ea7d5f148","https://git.kernel.org/stable/c/a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785","https://git.kernel.org/stable/c/2f958b6f6ba0854b39be748d21dfe71e0fe6580f","https://git.kernel.org/stable/c/5b991df8881088448cb223e769e37cab8dd40706","https://git.kernel.org/stable/c/34e7434ba4e97f4b85c1423a59b2922ba7dff2ea"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47355.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47355","state":"PUBLISHED","datePublished":"2024-05-21T14:35:58.434Z","dateUpdated":"2026-05-11T13:53:06.301Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:28:16.987Z"},"containers":{"cna":{"title":"atm: nicstar: Fix possible use-after-free in nicstar_cleanup()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\natm: nicstar: Fix possible use-after-free in nicstar_cleanup()\n\nThis module's remove path calls del_timer(). 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