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CVE-2025-21872— efi: Don't map the entire mokvar table to determine its size

EPSS 0.02% · P5

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinux58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5< 46c0454ffb78ce9d3355a3cccac86383ea8ddd55affected
58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5< ea3f0b362dfe4ef885ef812bfaf4088176422c91affected
58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5< 65f4aebb8127708ba668dd938e83b8558abfc5cdaffected
58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5< 97bd560b6cc4c26386a53b4881bf03e96f9ba03aaffected
58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5< 2b90e7ace79774a3540ce569e000388f8d22c9e0affected
5.10affected
< 5.10unaffected
5.10.235≤ 5.10.*unaffected
… +4 more rows
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I. Basic Information for CVE-2025-21872

Vulnerability Information
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Vulnerability Title
efi: Don't map the entire mokvar table to determine its size
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确处理mokvar表大小计算，可能导致内存映射失败。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 ~ 46c0454ffb78ce9d3355a3cccac86383ea8ddd55 -
LinuxLinux 5.10 -

II. Public POCs for CVE-2025-21872

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III. Intelligence Information for CVE-2025-21872

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Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

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Showing top 20 of 124 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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