{"id":"CVE-2021-47278","state":"PUBLISHED","title":"bus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove()\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.","publishedAt":"2024-05-21T14:20:05.394Z","updatedAt":"2026-05-11T13:51:25.106Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8562d4fe34a3ef52da077f77985994bb9ad1f83e","status":"affected","lessThan":"c597d5c59c7a6417dba06590f59b922e01188e8d","versionType":"git"},{"version":"8562d4fe34a3ef52da077f77985994bb9ad1f83e","status":"affected","lessThan":"0b67808ade8893a1b3608ddd74fac7854786c919","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bus/mhi/pci_generic.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.11","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/bus/mhi/pci_generic.c"]}],"references":["https://git.kernel.org/stable/c/c597d5c59c7a6417dba06590f59b922e01188e8d","https://git.kernel.org/stable/c/0b67808ade8893a1b3608ddd74fac7854786c919"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47278.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47278","state":"PUBLISHED","datePublished":"2024-05-21T14:20:05.394Z","dateUpdated":"2026-05-11T13:51:25.106Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T13:27:52.128Z"},"containers":{"cna":{"title":"bus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove()\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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8562d4fe34a3ef52da077f77985994bb9ad1f83e","status":"affected","lessThan":"c597d5c59c7a6417dba06590f59b922e01188e8d","versionType":"git"},{"version":"8562d4fe34a3ef52da077f77985994bb9ad1f83e","status":"affected","lessThan":"0b67808ade8893a1b3608ddd74fac7854786c919","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bus/mhi/pci_generic.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.11","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/bus/mhi/pci_generic.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c597d5c59c7a6417dba06590f59b922e01188e8d"},{"url":"https://git.kernel.org/stable/c/0b67808ade8893a1b3608ddd74fac7854786c919"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:51:25.106Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.12.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/c597d5c59c7a6417dba06590f59b922e01188e8d","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0b67808ade8893a1b3608ddd74fac7854786c919","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:07.984Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-08-19T18:51:32.273836Z","id":"CVE-2021-47278","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-08-19T18:52:06.160Z"}}]}}}