{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47111","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-03-04T18:12:48.836Z","datePublished":"2024-03-15T20:14:19.898Z","dateUpdated":"2025-05-04T07:04:23.529Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:04:23.529Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: take a reference to the RX task thread\n\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/interface.c"],"versions":[{"version":"2ac061ce97f413bfbbdd768f7d2e0fda2e8170df","lessThan":"6b53db8c4c14b4e7256f058d202908b54a7b85b4","status":"affected","versionType":"git"},{"version":"2ac061ce97f413bfbbdd768f7d2e0fda2e8170df","lessThan":"caec9bcaeb1a5f03f2d406305355c853af10c13e","status":"affected","versionType":"git"},{"version":"2ac061ce97f413bfbbdd768f7d2e0fda2e8170df","lessThan":"107866a8eb0b664675a260f1ba0655010fac1e08","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/net/xen-netback/interface.c"],"versions":[{"version":"5.5","status":"affected"},{"version":"0","lessThan":"5.5","status":"unaffected","versionType":"semver"},{"version":"5.10.43","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.10","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","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":"5.5","versionEndExcluding":"5.10.43"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.12.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4"},{"url":"https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e"},{"url":"https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08"}],"title":"xen-netback: take a reference to the RX task thread","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-06-26T20:36:51.215407Z","id":"CVE-2021-47111","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-26T20:36:58.053Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:24:39.854Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08","tags":["x_transferred"]}]}]}}