net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition
In the Linux kernel, the following vulnerability has been resolved: net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition When smc_llc_event_handler() transitions the local LLC flow from SMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK request, it calls smc_llc_flow_qentry_set() unconditionally: if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) { lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK; smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry); ... } A CONFIRM_LINK or ADD_LINK_CONT arriving while flow->type is SMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow->qentry via the SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into flow->qentry for any non-NONE flow type). When the subsequent ADD_LINK arrives, the REQ_ADD_LINK branch overwrites flow->qentry with the new pointer without first freeing the stashed allocation, leaking one kmalloc object. The stashed entry has no consumer: smc_llc_wait() is only called from llc_add_link_work, which is not yet scheduled while the flow type remains REQ_ADD_LINK. No waiter is sleeping on llc_msg_waiter at this point. It is safe to unconditionally free any stashed qentry before the overwrite. Call smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the REQ_ADD_LINK branch. smc_llc_flow_qentry_del() already checks flow->qentry before freeing, so the normal path where no entry is stashed is a no-op.
CVE-2026-90108
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-2026-90108
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": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "7dd55348c0d9399a9448847819e9f3904ae507ad",
"versionType": "git"
},
{
"status": "affected",
"version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "056395acb7041b3a1f2baa08d89a1938a8b8776a",
"versionType": "git"
},
{
"status": "affected",
"version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "b08aacfb226a840628151643b6a34eecf545d311",
"versionType": "git"
},
{
"status": "affected",
"version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "0fb9a513766071ea9d5f3bf988e39241b8e9ee3b",
"versionType": "git"
},
{
"status": "affected",
"version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "e25a602c45c76a7130878db72bcf6f76df04bf85",
"versionType": "git"
},
{
"status": "affected",
"version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196",
"lessThan": "036322025d6e440cb75fc6fecbba9a16b271a2ae",
"versionType": "git"
}
],
"programFiles": [
"net/smc/smc_llc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"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": [
"net/smc/smc_llc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90108
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36514 · Revision 1
- Added to Heist Feed
- Publisher date