{"id":"CVE-2021-46991","state":"PUBLISHED","title":"i40e: Fix use-after-free in i40e_client_subtask()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: Fix use-after-free in i40e_client_subtask()\n\nCurrently the call to i40e_client_del_instance frees the object\npf->cinst, however pf->cinst->lan_info is being accessed after\nthe free. Fix this by adding the missing return.\n\nAddresses-Coverity: (\"Read from pointer after free\")","publishedAt":"2024-02-28T08:13:17.195Z","updatedAt":"2026-05-11T13:45:50.600Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"c1322eaeb8af0d8985b5cc5fa759140fa0e57b84","versionType":"git"},{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"d718c15a2bf9ae082d5ae4d177fb19ef23cb4132","versionType":"git"},{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"829a713450b8fb127cbabfc1244c1d8179ec5107","versionType":"git"},{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"4ebc10aa7cd17fd9857dedac69600465c9dd16d1","versionType":"git"},{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"1fd5d262e7442192ac7611ff1597a36c5b044323","versionType":"git"},{"version":"7b0b1a6d0ac983ce1928432285d0222d4fb7c38b","status":"affected","lessThan":"38318f23a7ef86a8b1862e5e8078c4de121960c3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/intel/i40e/i40e_client.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"4.19.191","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.120","status":"unaffected","lessThanOrEqual":"5.4.*","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/ethernet/intel/i40e/i40e_client.c"]}],"references":["https://git.kernel.org/stable/c/c1322eaeb8af0d8985b5cc5fa759140fa0e57b84","https://git.kernel.org/stable/c/d718c15a2bf9ae082d5ae4d177fb19ef23cb4132","https://git.kernel.org/stable/c/829a713450b8fb127cbabfc1244c1d8179ec5107","https://git.kernel.org/stable/c/4ebc10aa7cd17fd9857dedac69600465c9dd16d1","https://git.kernel.org/stable/c/1fd5d262e7442192ac7611ff1597a36c5b044323","https://git.kernel.org/stable/c/38318f23a7ef86a8b1862e5e8078c4de121960c3"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:16.371Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/46xxx/CVE-2021-46991.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-46991","state":"PUBLISHED","datePublished":"2024-02-28T08:13:17.195Z","dateUpdated":"2026-05-11T13:45:50.600Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-27T18:42:55.949Z"},"containers":{"cna":{"title":"i40e: Fix use-after-free in i40e_client_subtask()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: Fix use-after-free in i40e_client_subtask()\n\nCurrently the call to i40e_client_del_instance frees the object\npf->cinst, however pf->cinst->lan_info is being accessed after\nthe free. 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