dm-crypt: reject the lmk IV mode with AEAD ciphers
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.
CVE-2026-99037
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-2026-99037
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": "33d2f09fcb357fd1861c4959d1d3505492bf91f8",
"lessThan": "9a0dab8a9d9975dec14a118b55cae2517aea5ca9",
"versionType": "git"
},
{
"status": "affected",
"version": "33d2f09fcb357fd1861c4959d1d3505492bf91f8",
"lessThan": "962ce265fbf5d87afeb78cf19c12e083ab0ffeb8",
"versionType": "git"
},
{
"status": "affected",
"version": "33d2f09fcb357fd1861c4959d1d3505492bf91f8",
"lessThan": "a1a875614dae43b43d311bb9e7a7a70eed78efe6",
"versionType": "git"
},
{
"status": "affected",
"version": "33d2f09fcb357fd1861c4959d1d3505492bf91f8",
"lessThan": "40ea7dfa8cd5f9aed72a55c9ca3008aee5880e6f",
"versionType": "git"
},
{
"status": "affected",
"version": "33d2f09fcb357fd1861c4959d1d3505492bf91f8",
"lessThan": "3195e0daf590683992edb4eed32269e569e04924",
"versionType": "git"
}
],
"programFiles": [
"drivers/md/dm-crypt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/md/dm-crypt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99037
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52870 · Revision 1
- Added to Heist Feed
- Publisher date