crash_dump: release keyring reference at the correct time
In the Linux kernel, the following vulnerability has been resolved: crash_dump: release keyring reference at the correct time restore_dm_crypt_keys_to_thread_keyring() gets a reference to the user keyring before restoring the saved dm-crypt keys. The same keyring reference is then passed to add_key_to_keyring() for each saved key, but add_key_to_keyring() drops that reference on every call. This is only balanced when exactly one key is restored. With multiple keys, the keyring reference is dropped too many times and may trigger a refcount underflow or use-after-free. When more than five keys are restored, a refcount underflow/use-after-free warning can be triggered. The early error paths after lookup_user_key() also return without dropping the keyring reference. Keep ownership of the keyring reference in restore_dm_crypt_keys_to_thread_keyring(), drop it once on all exit paths, and make add_key_to_keyring() only use the reference without consuming it.
CVE-2026-93106
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-2026-93106
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": "62f17d9df6924cf805de5ae970470615c1c8d9f2",
"lessThan": "b0f7343a002f9c8b8378011f60482c76f3216dfd",
"versionType": "git"
},
{
"status": "affected",
"version": "62f17d9df6924cf805de5ae970470615c1c8d9f2",
"lessThan": "ed566979f99c5516cad45a76ae25e2a4928ffb67",
"versionType": "git"
},
{
"status": "affected",
"version": "62f17d9df6924cf805de5ae970470615c1c8d9f2",
"lessThan": "ada2e5a44e99113e08ad9b7b71396c6c572204da",
"versionType": "git"
}
],
"programFiles": [
"kernel/crash_dump_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": "6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/crash_dump_dm_crypt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93106
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37834 · Revision 1
- Added to Heist Feed
- Publisher date