{"id":"CVE-2023-52633","state":"PUBLISHED","title":"um: time-travel: fix time corruption","description":"In the Linux kernel, the following vulnerability has been resolved:\n\num: time-travel: fix time corruption\n\nIn 'basic' time-travel mode (without =inf-cpu or =ext), we\nstill get timer interrupts. These can happen at arbitrary\npoints in time, i.e. while in timer_read(), which pushes\ntime forward just a little bit. Then, if we happen to get\nthe interrupt after calculating the new time to push to,\nbut before actually finishing that, the interrupt will set\nthe time to a value that's incompatible with the forward,\nand we'll crash because time goes backwards when we do the\nforwarding.\n\nFix this by reading the time_travel_time, calculating the\nadjustment, and doing the adjustment all with interrupts\ndisabled.","publishedAt":"2024-04-02T06:49:11.596Z","updatedAt":"2026-05-11T19:30:44.289Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"0c7478a2da3f5fe106b4658338873d50c86ac7ab","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"4f7dad73df4cdb2b7042103d3922745d040ad025","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"de3e9d8e8d1ae0a4d301109d1ec140796901306c","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"b427f55e9d4185f6f17cc1e3296eb8d0c4425283","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"abe4eaa8618bb36c2b33e9cdde0499296a23448c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/um/kernel/time.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/um/kernel/time.c"]}],"references":["https://git.kernel.org/stable/c/0c7478a2da3f5fe106b4658338873d50c86ac7ab","https://git.kernel.org/stable/c/4f7dad73df4cdb2b7042103d3922745d040ad025","https://git.kernel.org/stable/c/de3e9d8e8d1ae0a4d301109d1ec140796901306c","https://git.kernel.org/stable/c/b427f55e9d4185f6f17cc1e3296eb8d0c4425283","https://git.kernel.org/stable/c/abe4eaa8618bb36c2b33e9cdde0499296a23448c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52633.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52633","state":"PUBLISHED","datePublished":"2024-04-02T06:49:11.596Z","dateUpdated":"2026-05-11T19:30:44.289Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-06T09:52:12.092Z"},"containers":{"cna":{"title":"um: time-travel: fix time corruption","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\num: time-travel: fix time corruption\n\nIn 'basic' time-travel mode (without =inf-cpu or =ext), we\nstill get timer interrupts. These can happen at arbitrary\npoints in time, i.e. while in timer_read(), which pushes\ntime forward just a little bit. Then, if we happen to get\nthe interrupt after calculating the new time to push to,\nbut before actually finishing that, the interrupt will set\nthe time to a value that's incompatible with the forward,\nand we'll crash because time goes backwards when we do the\nforwarding.\n\nFix this by reading the time_travel_time, calculating the\nadjustment, and doing the adjustment all with interrupts\ndisabled."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"0c7478a2da3f5fe106b4658338873d50c86ac7ab","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"4f7dad73df4cdb2b7042103d3922745d040ad025","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"de3e9d8e8d1ae0a4d301109d1ec140796901306c","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"b427f55e9d4185f6f17cc1e3296eb8d0c4425283","versionType":"git"},{"version":"065038706f77a56754e8f0c2556dab7e22dfe577","status":"affected","lessThan":"abe4eaa8618bb36c2b33e9cdde0499296a23448c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/um/kernel/time.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/um/kernel/time.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0c7478a2da3f5fe106b4658338873d50c86ac7ab"},{"url":"https://git.kernel.org/stable/c/4f7dad73df4cdb2b7042103d3922745d040ad025"},{"url":"https://git.kernel.org/stable/c/de3e9d8e8d1ae0a4d301109d1ec140796901306c"},{"url":"https://git.kernel.org/stable/c/b427f55e9d4185f6f17cc1e3296eb8d0c4425283"},{"url":"https://git.kernel.org/stable/c/abe4eaa8618bb36c2b33e9cdde0499296a23448c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:30:44.289Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.7.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/0c7478a2da3f5fe106b4658338873d50c86ac7ab","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/4f7dad73df4cdb2b7042103d3922745d040ad025","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/de3e9d8e8d1ae0a4d301109d1ec140796901306c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b427f55e9d4185f6f17cc1e3296eb8d0c4425283","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/abe4eaa8618bb36c2b33e9cdde0499296a23448c","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T23:03:21.364Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-52633","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:53:36.022908Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-11T17:33:38.365Z"}}]}}}