CVE-2026-97906bootconfig: Fix integer overflow in initrd size check
- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 26 days later
· 26 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected de462e5f10718517bacf2f84c8aa2804567ef7df – < 97be05f33f79342ea65d9b99c9ad07a93b8eef5a
- affected de462e5f10718517bacf2f84c8aa2804567ef7df – < 4d45bc0f8cdf606d5409b5f64a8a6609f6520c03
- affected de462e5f10718517bacf2f84c8aa2804567ef7df – < 8d4343a411eaa182d323ab5b149496416015f27d
- affected de462e5f10718517bacf2f84c8aa2804567ef7df – < bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6
- affected de462e5f10718517bacf2f84c8aa2804567ef7df – < 7812d6dab0698001e50e8c2f901e17da3eb6f429
- affected 32394df25d8e46935b442b429d74b37885c4f092
- affected 5.6.14 – < 5.7
- affected 5.7
- unaffected < 5.7
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/97be05f33f79342ea65d9b99c9ad07a93b8eef5a (opens in a new tab)
- https://git.kernel.org/stable/c/4d45bc0f8cdf606d5409b5f64a8a6609f6520c03 (opens in a new tab)
- https://git.kernel.org/stable/c/8d4343a411eaa182d323ab5b149496416015f27d (opens in a new tab)
- https://git.kernel.org/stable/c/bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6 (opens in a new tab)
- https://git.kernel.org/stable/c/7812d6dab0698001e50e8c2f901e17da3eb6f429 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86760 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-97906)Record last updated .