CVE-2026-97906
UnknownSummary
In the Linux kernel, in bootconfig, in get_boot_config_from_initrd(), a crafted initrd with a huge bootconfig size (e.g., 0xFFFFFFFF) can cause pointer arithmetic to wrap around on 32-bit systems, bypassing bounds checks and leading to a fatal page fault during early boot.
Risk Assessment
The vulnerability may allow an attacker with initrd access to cause a system crash during boot, leading to denial of service.
Recommendation
Apply the patch that ensures the initrd is large enough to contain the bootconfig footer and that the size does not exceed XBC_DATA_MAX and available space.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bootconfig: Fix integer overflow in initrd size check Sashiko reported that in get_boot_config_from_initrd(), a crafted initrd with a huge bootconfig size (such as 0xFFFFFFFF) can cause the pointer arithmetic: data = ((void *)hdr) - size; to wrap around on 32-bit systems (or when pointer subtraction overflows). Because data wraps around, the subsequent bounds check: if ((unsigned long)data < initrd_start) evaluates to false, bypassing the check. The kernel then calls xbc_calc_checksum(data, size), which attempts to read 4GB of memory, hitting unmapped pages and triggering a fatal kernel page fault during early boot. Furthermore, on 64-bit systems with an initrd > 4.29 GB, an unbounded 32-bit size can similarly bypass the initrd_start check. Fix this by: 1. Ensuring the initrd is at least large enough to contain the bootconfig footer and verifying hdr is within the initrd bounds. 2. Checking that size does not exceed XBC_DATA_MAX and does not exceed the available space between initrd_start and hdr before performing pointer subtraction.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS