GHSA-MW8R-CVFC-F297
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
net/smc: free pending qentry in smc_llc_flow_stop() before memset
smc_llc_flow_stop() resets a flow struct with a blind memset:
spin_lock_bh(&lgr->llc_flow_lock);
memset(flow, 0, sizeof(*flow));
flow->type = SMC_LLC_FLOW_NONE;
spin_unlock_bh(&lgr->llc_flow_lock);
If flow->qentry is non-NULL at this point the pointer is overwritten without the allocation being freed, leaking one kmalloc object.
A late-arriving duplicate CONFIRM_LINK or ADD_LINK_CONT message can set flow->qentry after the legitimate message has been consumed by the waiter via smc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow->type non-zero) but before the flow completes and smc_llc_flow_stop() runs. In that window the duplicate is stashed into flow->qentry, and then lost when smc_llc_flow_stop() zeros the struct.
Call smc_llc_flow_qentry_del() inside the lock before the memset. smc_llc_flow_qentry_del() already checks flow->qentry before freeing, so the normal case where no entry is pending is a no-op.
{
"affected": [],
"aliases": [
"CVE-2026-90107"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:02Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free pending qentry in smc_llc_flow_stop() before memset\n\nsmc_llc_flow_stop() resets a flow struct with a blind memset:\n\n\tspin_lock_bh(\u0026lgr-\u003ellc_flow_lock);\n\tmemset(flow, 0, sizeof(*flow));\n\tflow-\u003etype = SMC_LLC_FLOW_NONE;\n\tspin_unlock_bh(\u0026lgr-\u003ellc_flow_lock);\n\nIf flow-\u003eqentry is non-NULL at this point the pointer is overwritten without the\nallocation being freed, leaking one kmalloc object.\n\nA late-arriving duplicate CONFIRM_LINK or ADD_LINK_CONT message can set\nflow-\u003eqentry after the legitimate message has been consumed by the waiter via\nsmc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow-\u003etype\nnon-zero) but before the flow completes and smc_llc_flow_stop() runs. In that\nwindow the duplicate is stashed into flow-\u003eqentry, and then lost when\nsmc_llc_flow_stop() zeros the struct.\n\nCall smc_llc_flow_qentry_del() inside the lock before the memset.\nsmc_llc_flow_qentry_del() already checks flow-\u003eqentry before freeing, so the\nnormal case where no entry is pending is a no-op.",
"id": "GHSA-mw8r-cvfc-f297",
"modified": "2026-09-17T18:31:51Z",
"published": "2026-09-17T18:31:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90107"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/032aec7d03c9102616b98fea74f8f7145e7f867c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0879ea157acc1ac6752f6fcb755d1f91a2359238"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/11bc373ee6630709f0c2da2e7860c23d503c9e9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5ee0ceddc7785c6dcf4a8107fef01f0414a354f4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8e3deb150a5237b672c4579e69a6deb02027dbed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/957dba2b8b5aebfe09caa6a6b22b958079082eab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f03aa5d36ae3c4068a1c3885146be99aa7fd9307"
}
],
"schema_version": "1.4.0",
"severity": []
}
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