CVE-2026-97906

CVE CVE-2026-97906EUVD EUVD-2026-86760Published 2026-09-25T10:22:31.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.53; patch: 7.2.7; 5.7; de462e5f10718517bacf2f84c8aa2804567ef7df <7812d6dab0698001e50e8c2f901e17da3eb6f429; patch: 0; de462e5f10718517bacf2f84c8aa2804567ef7df <bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6; de462e5f10718517bacf2f84c8aa2804567ef7df <8d4343a411eaa182d323ab5b149496416015f27d; patch: 7.3-rc3; 32394df25d8e46935b442b429d74b37885c4f092; 5.6.14 <5.7

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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