{"id":"CVE-2026-43171","state":"PUBLISHED","title":"EFI/CPER: don't dump the entire memory region","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't dump the entire memory region\n\nThe current logic at cper_print_fw_err() doesn't check if the\nerror record length is big enough to handle offset. On a bad firmware,\nif the ofset is above the actual record, length -= offset will\nunderflow, making it dump the entire memory.\n\nThe end result can be:\n\n - the logic taking a lot of time dumping large regions of memory;\n - data disclosure due to the memory dumps;\n - an OOPS, if it tries to dump an unmapped memory region.\n\nFix it by checking if the section length is too small before doing\na hex dump.\n\n[ rjw: Subject tweaks ]","publishedAt":"2026-05-06T11:27:46.698Z","updatedAt":"2026-05-11T22:19:09.627Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"02de64ab54b4bb0f1b21bb324aeff3b08612be33","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"0e09b522f2622841389c3b2f9ac4969e35c0809d","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"64ae5aaa7ac93c83da456039e8ec747bfa8a7cff","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"5a9b1dda8481b82851a655c3bcc5b44879b95334","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"7780c0bad2a3a70a8c0113a33c02f4151d901eb3","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"54e131db4cdffd946db890ff33ff2647053fd4f6","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"55cc6fe5716f678f06bcb95140882dfa684464ec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/efi/cper.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.75","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":["drivers/firmware/efi/cper.c"]}],"references":["https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33","https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d","https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff","https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334","https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3","https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91","https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6","https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43171.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43171","state":"PUBLISHED","datePublished":"2026-05-06T11:27:46.698Z","dateUpdated":"2026-05-11T22:19:09.627Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.990Z"},"containers":{"cna":{"title":"EFI/CPER: don't dump the entire memory region","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't dump the entire memory region\n\nThe current logic at cper_print_fw_err() doesn't check if the\nerror record length is big enough to handle offset. On a bad firmware,\nif the ofset is above the actual record, length -= offset will\nunderflow, making it dump the entire memory.\n\nThe end result can be:\n\n - the logic taking a lot of time dumping large regions of memory;\n - data disclosure due to the memory dumps;\n - an OOPS, if it tries to dump an unmapped memory region.\n\nFix it by checking if the section length is too small before doing\na hex dump.\n\n[ rjw: Subject tweaks ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"02de64ab54b4bb0f1b21bb324aeff3b08612be33","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"0e09b522f2622841389c3b2f9ac4969e35c0809d","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"64ae5aaa7ac93c83da456039e8ec747bfa8a7cff","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"5a9b1dda8481b82851a655c3bcc5b44879b95334","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"7780c0bad2a3a70a8c0113a33c02f4151d901eb3","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"54e131db4cdffd946db890ff33ff2647053fd4f6","versionType":"git"},{"version":"3d8c11efd528d56972d44ed0de51c4e11a9a4fa9","status":"affected","lessThan":"55cc6fe5716f678f06bcb95140882dfa684464ec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/efi/cper.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.75","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":["drivers/firmware/efi/cper.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33"},{"url":"https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d"},{"url":"https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff"},{"url":"https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334"},{"url":"https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3"},{"url":"https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91"},{"url":"https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6"},{"url":"https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:19:09.627Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}