{"id":"CVE-2026-43266","state":"PUBLISHED","title":"EFI/CPER: don't go past the ARM processor CPER record buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't go past the ARM processor CPER record buffer\n\nThere's a logic inside GHES/CPER to detect if the section_length\nis too small, but it doesn't detect if it is too big.\n\nCurrently, if the firmware receives an ARM processor CPER record\nstating that a section length is big, kernel will blindly trust\nsection_length, producing a very long dump. For instance, a 67\nbytes record with ERR_INFO_NUM set 46198 and section length\nset to 854918320 would dump a lot of data going a way past the\nfirmware memory-mapped area.\n\nFix it by adding a logic to prevent it to go past the buffer\nif ERR_INFO_NUM is too big, making it report instead:\n\n\t[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1\n\t[Hardware Error]: event severity: recoverable\n\t[Hardware Error]:  Error 0, type: recoverable\n\t[Hardware Error]:   section_type: ARM processor error\n\t[Hardware Error]:   MIDR: 0xff304b2f8476870a\n\t[Hardware Error]:   section length: 854918320, CPER size: 67\n\t[Hardware Error]:   section length is too big\n\t[Hardware Error]:   firmware-generated error record is incorrect\n\t[Hardware Error]:   ERR_INFO_NUM is 46198\n\n[ rjw: Subject and changelog tweaks ]","publishedAt":"2026-05-06T11:28:52.238Z","updatedAt":"2026-05-11T22:21:14.159Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"c80113dcfc807308f5ab33847fae77e07531aeb8","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"a68d22902a6916e10ee235fee609239004e129d0","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"64eb63f573f497553e1a0c388bbcdd639e0f0704","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"be10c1bdf64a39832998f54900aa309b3917abcf","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"25b290624b0e3d2f0f90238709ee0b6009b9fde8","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"45766863baf899059e75595dd3cb1116467f2095","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"eae21beecb95a3b69ee5c38a659f774e171d730e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/efi/cper-arm.c","drivers/firmware/efi/cper.c","include/linux/cper.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","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-arm.c","drivers/firmware/efi/cper.c","include/linux/cper.h"]}],"references":["https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8","https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4","https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0","https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704","https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf","https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8","https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095","https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43266.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43266","state":"PUBLISHED","datePublished":"2026-05-06T11:28:52.238Z","dateUpdated":"2026-05-11T22:21:14.159Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.997Z"},"containers":{"cna":{"title":"EFI/CPER: don't go past the ARM processor CPER record buffer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't go past the ARM processor CPER record buffer\n\nThere's a logic inside GHES/CPER to detect if the section_length\nis too small, but it doesn't detect if it is too big.\n\nCurrently, if the firmware receives an ARM processor CPER record\nstating that a section length is big, kernel will blindly trust\nsection_length, producing a very long dump. For instance, a 67\nbytes record with ERR_INFO_NUM set 46198 and section length\nset to 854918320 would dump a lot of data going a way past the\nfirmware memory-mapped area.\n\nFix it by adding a logic to prevent it to go past the buffer\nif ERR_INFO_NUM is too big, making it report instead:\n\n\t[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1\n\t[Hardware Error]: event severity: recoverable\n\t[Hardware Error]:  Error 0, type: recoverable\n\t[Hardware Error]:   section_type: ARM processor error\n\t[Hardware Error]:   MIDR: 0xff304b2f8476870a\n\t[Hardware Error]:   section length: 854918320, CPER size: 67\n\t[Hardware Error]:   section length is too big\n\t[Hardware Error]:   firmware-generated error record is incorrect\n\t[Hardware Error]:   ERR_INFO_NUM is 46198\n\n[ rjw: Subject and changelog tweaks ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"c80113dcfc807308f5ab33847fae77e07531aeb8","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"a68d22902a6916e10ee235fee609239004e129d0","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"64eb63f573f497553e1a0c388bbcdd639e0f0704","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"be10c1bdf64a39832998f54900aa309b3917abcf","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"25b290624b0e3d2f0f90238709ee0b6009b9fde8","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"45766863baf899059e75595dd3cb1116467f2095","versionType":"git"},{"version":"2f74f09bce4f8d0236f20174a6daae63e10fe733","status":"affected","lessThan":"eae21beecb95a3b69ee5c38a659f774e171d730e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/efi/cper-arm.c","drivers/firmware/efi/cper.c","include/linux/cper.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","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-arm.c","drivers/firmware/efi/cper.c","include/linux/cper.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8"},{"url":"https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4"},{"url":"https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0"},{"url":"https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704"},{"url":"https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf"},{"url":"https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8"},{"url":"https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095"},{"url":"https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:21:14.159Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}