bootconfig: Fix integer overflow in initrd size check
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.
CVE-2026-97906
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97906
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "de462e5f10718517bacf2f84c8aa2804567ef7df",
"lessThan": "97be05f33f79342ea65d9b99c9ad07a93b8eef5a",
"versionType": "git"
},
{
"status": "affected",
"version": "de462e5f10718517bacf2f84c8aa2804567ef7df",
"lessThan": "4d45bc0f8cdf606d5409b5f64a8a6609f6520c03",
"versionType": "git"
},
{
"status": "affected",
"version": "de462e5f10718517bacf2f84c8aa2804567ef7df",
"lessThan": "8d4343a411eaa182d323ab5b149496416015f27d",
"versionType": "git"
},
{
"status": "affected",
"version": "de462e5f10718517bacf2f84c8aa2804567ef7df",
"lessThan": "bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6",
"versionType": "git"
},
{
"status": "affected",
"version": "de462e5f10718517bacf2f84c8aa2804567ef7df",
"lessThan": "7812d6dab0698001e50e8c2f901e17da3eb6f429",
"versionType": "git"
},
{
"status": "affected",
"version": "32394df25d8e46935b442b429d74b37885c4f092",
"versionType": "git"
},
{
"status": "affected",
"version": "5.6.14",
"lessThan": "5.7",
"versionType": "semver"
}
],
"programFiles": [
"init/main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"init/main.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97906
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48799 · Revision 1
- Added to Heist Feed
- Publisher date