dlm: fix add msg handle in send_queue ordered
In the Linux kernel, the following vulnerability has been resolved: dlm: fix add msg handle in send_queue ordered In a benchmark scenario triggering a lot of requests that triggers a lot of DLM messages on the network it can be that the mh->seq is not ordered according the oldest seq number. This ordering is required by dlm_receive_ack as "before(mh->seq, seq)" will stop to check for older sequence numbers that are ordered in the tail of "node->send_queue". The side effects of not having it correct ordered regarding "before(mh->seq, seq)" are refcounting issues and use-after free. I only was able to reproduce this issue in a experimental DLM branch and a user space DLM benchmark that uses io_uring. After changing this I don't experienced any refcounting with the sending buffer issues anymore.
CVE-2026-74401
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-2026-74401
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": "489d8e559c6596eb08e16447d9830bc39afbe54e",
"lessThan": "ae9e534e502a0f48c12baf83608c5de0ff0eab11",
"versionType": "git"
},
{
"status": "affected",
"version": "489d8e559c6596eb08e16447d9830bc39afbe54e",
"lessThan": "6369619f1b665f12d8c99cc6ff733c64eb08b22e",
"versionType": "git"
},
{
"status": "affected",
"version": "489d8e559c6596eb08e16447d9830bc39afbe54e",
"lessThan": "712714f818d83373847874ab0f8e426be79296cf",
"versionType": "git"
},
{
"status": "affected",
"version": "489d8e559c6596eb08e16447d9830bc39afbe54e",
"lessThan": "4d45250b1d22960f86d83245be188b16e456218b",
"versionType": "git"
},
{
"status": "affected",
"version": "489d8e559c6596eb08e16447d9830bc39afbe54e",
"lessThan": "d2248cb70c070f8f04762872772e155b59016f17",
"versionType": "git"
}
],
"programFiles": [
"fs/dlm/midcomms.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/dlm/midcomms.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74401
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33138 · Revision 1
- Added to Heist Feed
- Publisher date