{"id":"CVE-2026-43240","state":"PUBLISHED","title":"x86/kexec: add a sanity check on previous kernel's ima kexec buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kexec: add a sanity check on previous kernel's ima kexec buffer\n\nWhen the second-stage kernel is booted via kexec with a limiting command\nline such as \"mem=<size>\", the physical range that contains the carried\nover IMA measurement list may fall outside the truncated RAM leading to a\nkernel panic.\n\n    BUG: unable to handle page fault for address: ffff97793ff47000\n    RIP: ima_restore_measurement_list+0xdc/0x45a\n    #PF: error_code(0x0000) – not-present page\n\nOther architectures already validate the range with page_is_ram(), as done\nin commit cbf9c4b9617b (\"of: check previous kernel's ima-kexec-buffer\nagainst memory bounds\") do a similar check on x86.\n\nWithout carrying the measurement list across kexec, the attestation\nwould fail.","publishedAt":"2026-05-06T11:28:34.269Z","updatedAt":"2026-06-19T11:58:23.596Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"37f18915a261afe84dab462624ed829cddb77a9b","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"22e460b6333a5f818b042ac89201f8e735556f4a","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"7e2476057950c174c7b2c2802246707bbfb497e4","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"f8f73bf0f8a57ee9b86792456bd42079bc98c6b7","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"d4a132f121c591b60dbaf57ea91f1faf11631fbc","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"4d7a8f5f28187e3d2958b2a134473da2665207e7","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"c5489d04337b47e93c0623e8145fcba3f5739efd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/setup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/setup.c"]}],"references":["https://git.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9b","https://git.kernel.org/stable/c/22e460b6333a5f818b042ac89201f8e735556f4a","https://git.kernel.org/stable/c/7e2476057950c174c7b2c2802246707bbfb497e4","https://git.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7","https://git.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbc","https://git.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7","https://git.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efd"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43240.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43240","state":"PUBLISHED","datePublished":"2026-05-06T11:28:34.269Z","dateUpdated":"2026-06-19T11:58:23.596Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.995Z"},"containers":{"cna":{"title":"x86/kexec: add a sanity check on previous kernel's ima kexec buffer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kexec: add a sanity check on previous kernel's ima kexec buffer\n\nWhen the second-stage kernel is booted via kexec with a limiting command\nline such as \"mem=<size>\", the physical range that contains the carried\nover IMA measurement list may fall outside the truncated RAM leading to a\nkernel panic.\n\n    BUG: unable to handle page fault for address: ffff97793ff47000\n    RIP: ima_restore_measurement_list+0xdc/0x45a\n    #PF: error_code(0x0000) – not-present page\n\nOther architectures already validate the range with page_is_ram(), as done\nin commit cbf9c4b9617b (\"of: check previous kernel's ima-kexec-buffer\nagainst memory bounds\") do a similar check on x86.\n\nWithout carrying the measurement list across kexec, the attestation\nwould fail."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"37f18915a261afe84dab462624ed829cddb77a9b","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"22e460b6333a5f818b042ac89201f8e735556f4a","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"7e2476057950c174c7b2c2802246707bbfb497e4","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"f8f73bf0f8a57ee9b86792456bd42079bc98c6b7","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"d4a132f121c591b60dbaf57ea91f1faf11631fbc","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"4d7a8f5f28187e3d2958b2a134473da2665207e7","versionType":"git"},{"version":"b69a2afd5afce9bf6d56e349d6ab592c916e20f2","status":"affected","lessThan":"c5489d04337b47e93c0623e8145fcba3f5739efd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/setup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kernel/setup.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9b"},{"url":"https://git.kernel.org/stable/c/22e460b6333a5f818b042ac89201f8e735556f4a"},{"url":"https://git.kernel.org/stable/c/7e2476057950c174c7b2c2802246707bbfb497e4"},{"url":"https://git.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7"},{"url":"https://git.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbc"},{"url":"https://git.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7"},{"url":"https://git.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-19T11:58:23.596Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}