CVE-2026-43171
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't dump the entire memory region The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory. The end result can be: - the logic taking a lot of time dumping large regions of memory; - data disclosure due to the memory dumps; - an OOPS, if it tries to dump an unmapped memory region. Fix it by checking if the section length is too small before doing a hex dump. [ rjw: Subject tweaks ]
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-06 12:16:35.447000
Last modified
2026-11-06 16:18:27.453000
View original CVE JSON
{
"id": "CVE-2026-43171",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-05-06T12:16:35.447",
"lastModified": "2026-11-06T16:18:27.453",
"vulnStatus": "Analyzed",
"cveTags": [],
"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": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/firmware/efi/cper.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "02de64ab54b4bb0f1b21bb324aeff3b08612be33",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "0e09b522f2622841389c3b2f9ac4969e35c0809d",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "64ae5aaa7ac93c83da456039e8ec747bfa8a7cff",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "5a9b1dda8481b82851a655c3bcc5b44879b95334",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "7780c0bad2a3a70a8c0113a33c02f4151d901eb3",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "54e131db4cdffd946db890ff33ff2647053fd4f6",
"versionType": "git",
"status": "affected"
},
{
"version": "3d8c11efd528d56972d44ed0de51c4e11a9a4fa9",
"lessThan": "55cc6fe5716f678f06bcb95140882dfa684464ec",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/firmware/efi/cper.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.7",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.7",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.252",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.202",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.165",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.128",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.75",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.16",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.19.6",
"lessThanOrEqual": "6.19.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.0",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-06T15:30:26.784250Z",
"id": "CVE-2026-43171",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-191"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartExcluding": "5.7",
"versionEndExcluding": "5.10.252",
"matchCriteriaId": "92C4581E-88B3-4AD3-AEE8-AA42DF330D60"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.11",
"versionEndExcluding": "5.15.202",
"matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.16",
"versionEndExcluding": "6.1.165",
"matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.2",
"versionEndExcluding": "6.6.128",
"matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.7",
"versionEndExcluding": "6.12.75",
"matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.13",
"versionEndExcluding": "6.18.16",
"matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.19",
"versionEndExcluding": "6.19.6",
"matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*",
"matchCriteriaId": "3D23CE42-BDB2-4216-8495-230ABE98FCDD"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:*",
"matchCriteriaId": "9D26AE9C-D49F-4FE9-8A6A-5A7199B7436E"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
}
]
}