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GHSA-9XMG-P5VW-VPRW

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

dm-crypt: reject the lmk IV mode with AEAD ciphers

A "capi:" table line that pairs an AEAD cipher with the lmk IV mode, for example "capi:gcm(aes)-lmk" with the integrity:28:aead option, causes an oops when it is loaded. lmk sets tfms_count to 64, but crypt_alloc_tfms_aead only allocates one transform, so crypt_setkey reads past the end of the tfms_aead array and calls crypto_aead_setkey on the values it finds there.

lmk exists for compatibility with Loop-AES, which uses CBC, so refuse it with an AEAD cipher rather than allocate 64 AEAD transforms. The check cannot go in crypt_iv_lmk_ctr with the other lmk checks, because the IV constructor runs after crypt_set_key.

Note that this is not a security bug because the memory corruption can only be triggered by root.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99037"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:26Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-crypt: reject the lmk IV mode with AEAD ciphers\n\nA \"capi:\" table line that pairs an AEAD cipher with the lmk IV mode,\nfor example \"capi:gcm(aes)-lmk\" with the integrity:28:aead option,\ncauses an oops when it is loaded. lmk sets tfms_count to 64, but\ncrypt_alloc_tfms_aead only allocates one transform, so crypt_setkey\nreads past the end of the tfms_aead array and calls crypto_aead_setkey\non the values it finds there.\n\nlmk exists for compatibility with Loop-AES, which uses CBC, so refuse\nit with an AEAD cipher rather than allocate 64 AEAD transforms. The\ncheck cannot go in crypt_iv_lmk_ctr with the other lmk checks, because\nthe IV constructor runs after crypt_set_key.\n\nNote that this is not a security bug because the memory corruption can\nonly be triggered by root.",
  "id": "GHSA-9xmg-p5vw-vprw",
  "modified": "2026-10-23T15:31:36Z",
  "published": "2026-10-23T15:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99037"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3195e0daf590683992edb4eed32269e569e04924"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/962ce265fbf5d87afeb78cf19c12e083ab0ffeb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a0dab8a9d9975dec14a118b55cae2517aea5ca9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1a875614dae43b43d311bb9e7a7a70eed78efe6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99037 (GCVE-0-2026-99037)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-23 12:21

Title

dm-crypt: reject the lmk IV mode with AEAD ciphers

Summary

In the Linux kernel, the following vulnerability has been resolved: dm-crypt: reject the lmk IV mode with AEAD ciphers A "capi:" table line that pairs an AEAD cipher with the lmk IV mode, for example "capi:gcm(aes)-lmk" with the integrity:28:aead option, causes an oops when it is loaded. lmk sets tfms_count to 64, but crypt_alloc_tfms_aead only allocates one transform, so crypt_setkey reads past the end of the tfms_aead array and calls crypto_aead_setkey on the values it finds there. lmk exists for compatibility with Loop-AES, which uses CBC, so refuse it with an AEAD cipher rather than allocate 64 AEAD transforms. The check cannot go in crypt_iv_lmk_ctr with the other lmk checks, because the IV constructor runs after crypt_set_key. Note that this is not a security bug because the memory corruption can only be triggered by root.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/9a0dab8a9d9975dec…
https://git.kernel.org/stable/c/962ce265fbf5d87af…
https://git.kernel.org/stable/c/a1a875614dae43b43…
https://git.kernel.org/stable/c/40ea7dfa8cd5f9aed…
https://git.kernel.org/stable/c/3195e0daf59068399…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 33d2f09fcb357fd1861c4959d1d3505492bf91f8 , < 9a0dab8a9d9975dec14a118b55cae2517aea5ca9 (git) Affected: 33d2f09fcb357fd1861c4959d1d3505492bf91f8 , < 962ce265fbf5d87afeb78cf19c12e083ab0ffeb8 (git) Affected: 33d2f09fcb357fd1861c4959d1d3505492bf91f8 , < a1a875614dae43b43d311bb9e7a7a70eed78efe6 (git) Affected: 33d2f09fcb357fd1861c4959d1d3505492bf91f8 , < 40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f (git) Affected: 33d2f09fcb357fd1861c4959d1d3505492bf91f8 , < 3195e0daf590683992edb4eed32269e569e04924 (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
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      "affected": [
        {
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          "programFiles": [
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              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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    "state": "PUBLISHED"
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}

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.
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