CVE-2026-43240 (GCVE-0-2026-43240)
Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-06-19 11:58
VLAI
EPSS
VEX
Title
x86/kexec: add a sanity check on previous kernel's ima kexec buffer
Summary
In the Linux kernel, the following vulnerability has been resolved:
x86/kexec: add a sanity check on previous kernel's ima kexec buffer
When the second-stage kernel is booted via kexec with a limiting command
line such as "mem=<size>", the physical range that contains the carried
over IMA measurement list may fall outside the truncated RAM leading to a
kernel panic.
BUG: unable to handle page fault for address: ffff97793ff47000
RIP: ima_restore_measurement_list+0xdc/0x45a
#PF: error_code(0x0000) – not-present page
Other architectures already validate the range with page_is_ram(), as done
in commit cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer
against memory bounds") do a similar check on x86.
Without carrying the measurement list across kexec, the attestation
would fail.
Severity
5.5 (Medium)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 37f18915a261afe84dab462624ed829cddb77a9b
(git)
Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 22e460b6333a5f818b042ac89201f8e735556f4a (git) Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 7e2476057950c174c7b2c2802246707bbfb497e4 (git) Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < f8f73bf0f8a57ee9b86792456bd42079bc98c6b7 (git) Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < d4a132f121c591b60dbaf57ea91f1faf11631fbc (git) Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 4d7a8f5f28187e3d2958b2a134473da2665207e7 (git) Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < c5489d04337b47e93c0623e8145fcba3f5739efd (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"current_release_date": "2026-06-28T07:36:20+00:00",
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"id": "CVE-2026-43240",
"initial_release_date": "2026-05-06T00:00:00+00:00",
"product_status:known_affected": "198",
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"title": "kernel: x86/kexec: add a sanity check on previous kernel\u0027s ima kexec buffer",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43240.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:19:35Z",
"cve": "CVE-2026-43240",
"id": "CVE-2026-43240",
"initial_release_date": "2026-05-09T02:40:21Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "424",
"product_status:known_not_affected": "279",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43240",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43240.json",
"version": "19"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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