Answer in brief
CVE-2026-97906 records a Unknown severity vulnerability in bootconfig: Fix integer overflow in initrd size check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=de462e5f10718517bacf2f84c8aa2804567ef7df <8d4343a411eaa182d323ab5b149496416015f27d || >=de462e5f10718517bacf2f84c8aa2804567ef7df <bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6 || >=de462e5f10718517bacf2f84c8aa2804567ef7df <7812d6dab0698001e50e8c2f901e17da3eb6f429 || 32394df25d8e46935b442b429d74b37885c4f092 || >=5.6.14 <5.7 | 8d4343a411eaa182d323ab5b149496416015f27d, bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6, 7812d6dab0698001e50e8c2f901e17da3eb6f429, 5.7 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.