CVE-2026-43171
CVE-2026-43171 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-27730
- Weakness: CWE-191
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
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 ]
Frequently asked questions
- What is CVE-2026-43171?
- 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 ]
- How severe is CVE-2026-43171?
- CVE-2026-43171 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-43171 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-43171?
- CVE-2026-43171 primarily affects Linux Linux Kernel. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-43171?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-43171 have an EU (EUVD) identifier?
- Yes. CVE-2026-43171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27730.
- When was CVE-2026-43171 published?
- CVE-2026-43171 was published on 2026-05-06 and last updated on 2026-06-17.
References
- https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33
- https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d
- https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6
- https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec
- https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334
- https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff
- https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3
- https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91
Affected products (3)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:*
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