CVE-2025-21872None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: efi: Don't map the entire mokvar table to determine its size Currently, when validating the mokvar table, we (re)map the entire table on each iteration of the loop, ad…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
efi: Don't map the entire mokvar table to determine its size
Currently, when validating the mokvar table, we (re)map the entire table on each iteration of the loop, adding space as we discover new entries. If the table grows over a certain size, this fails due to limitations of early_memmap(), and we get a failure and traceback:
------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at mm/early_ioremap.c:139 __early_ioremap+0xef/0x220 ... Call Trace: <TASK> ? __early_ioremap+0xef/0x220 ? __warn.cold+0x93/0xfa ? __early_ioremap+0xef/0x220 ? report_bug+0xff/0x140 ? early_fixup_exception+0x5d/0xb0 ? early_idt_handler_common+0x2f/0x3a ? __early_ioremap+0xef/0x220 ? efi_mokvar_table_init+0xce/0x1d0 ? setup_arch+0x864/0xc10 ? start_kernel+0x6b/0xa10 ? x86_64_start_reservations+0x24/0x30 ? x86_64_start_kernel+0xed/0xf0 ? common_startup_64+0x13e/0x141 </TASK> ---[ end trace 0000000000000000 ]--- mokvar: Failed to map EFI MOKvar config table pa=0x7c4c3000, size=265187.
Mapping the entire structure isn't actually necessary, as we don't ever need more than one entry header mapped at once.
Changes efi_mokvar_table_init() to only map each entry header, not the entire table, when determining the table size. Since we're not mapping any data past the variable name, it also changes the code to enforce that each variable name is NUL terminated, rather than attempting to verify it in place.
Linux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 46c0454ffb78ce9d3355a3cccac86383ea8ddd55Linux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < f17a72ac7dd6f9469c9e6185bdbb22dbb744dd74Linux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < ea3f0b362dfe4ef885ef812bfaf4088176422c91Linux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 65f4aebb8127708ba668dd938e83b8558abfc5cdLinux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 97bd560b6cc4c26386a53b4881bf03e96f9ba03aLinux >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 2b90e7ace79774a3540ce569e000388f8d22c9e0Linux 5.10Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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