{"id":"CVE-2021-46994","state":"PUBLISHED","title":"can: mcp251x: fix resume from sleep before interface was brought up","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: mcp251x: fix resume from sleep before interface was brought up\n\nSince 8ce8c0abcba3 the driver queues work via priv->restart_work when\nresuming after suspend, even when the interface was not previously\nenabled. This causes a null dereference error as the workqueue is only\nallocated and initialized in mcp251x_open().\n\nTo fix this we move the workqueue init to mcp251x_can_probe() as there\nis no reason to do it later and repeat it whenever mcp251x_open() is\ncalled.\n\n[mkl: fix error handling in mcp251x_stop()]","publishedAt":"2024-02-28T08:13:19.115Z","updatedAt":"2026-05-11T13:45:54.034Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"6f8f1c27b577de15f69fefce3c502bb6300d825c","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"e1e10a390fd9479209c4d834d916ca5e6d5d396b","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"03c427147b2d3e503af258711af4fc792b89b0af","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/spi/mcp251x.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.38","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.22","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.5","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/spi/mcp251x.c"]}],"references":["https://git.kernel.org/stable/c/eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21","https://git.kernel.org/stable/c/6f8f1c27b577de15f69fefce3c502bb6300d825c","https://git.kernel.org/stable/c/e1e10a390fd9479209c4d834d916ca5e6d5d396b","https://git.kernel.org/stable/c/03c427147b2d3e503af258711af4fc792b89b0af"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:16.371Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/46xxx/CVE-2021-46994.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-46994","state":"PUBLISHED","datePublished":"2024-02-28T08:13:19.115Z","dateUpdated":"2026-05-11T13:45:54.034Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-27T18:42:55.949Z"},"containers":{"cna":{"title":"can: mcp251x: fix resume from sleep before interface was brought up","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: mcp251x: fix resume from sleep before interface was brought up\n\nSince 8ce8c0abcba3 the driver queues work via priv->restart_work when\nresuming after suspend, even when the interface was not previously\nenabled. This causes a null dereference error as the workqueue is only\nallocated and initialized in mcp251x_open().\n\nTo fix this we move the workqueue init to mcp251x_can_probe() as there\nis no reason to do it later and repeat it whenever mcp251x_open() is\ncalled.\n\n[mkl: fix error handling in mcp251x_stop()]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"6f8f1c27b577de15f69fefce3c502bb6300d825c","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"e1e10a390fd9479209c4d834d916ca5e6d5d396b","versionType":"git"},{"version":"8ce8c0abcba314e1fe954a1840f6568bf5aef2ef","status":"affected","lessThan":"03c427147b2d3e503af258711af4fc792b89b0af","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/spi/mcp251x.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.38","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.22","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.5","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/spi/mcp251x.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21"},{"url":"https://git.kernel.org/stable/c/6f8f1c27b577de15f69fefce3c502bb6300d825c"},{"url":"https://git.kernel.org/stable/c/e1e10a390fd9479209c4d834d916ca5e6d5d396b"},{"url":"https://git.kernel.org/stable/c/03c427147b2d3e503af258711af4fc792b89b0af"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:45:54.034Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.38"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.11.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.12.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/6f8f1c27b577de15f69fefce3c502bb6300d825c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e1e10a390fd9479209c4d834d916ca5e6d5d396b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/03c427147b2d3e503af258711af4fc792b89b0af","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:24:38.558Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-46994","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:00:58.367712Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-11T17:33:38.479Z"}}]}}}