{"id":"CVE-2026-90108","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition\n\nWhen smc_llc_event_handler() transitions the local LLC flow from\nSMC_LLC_FLOW_REQ_…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition\n\nWhen smc_llc_event_handler() transitions the local LLC flow from\nSMC_LLC_FLOW_REQ_…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < 7dd55348c0d9399a9448847819e9f3904ae507ad","Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < 056395acb7041b3a1f2baa08d89a1938a8b8776a","Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < b08aacfb226a840628151643b6a34eecf545d311","Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < 0fb9a513766071ea9d5f3bf988e39241b8e9ee3b","Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < e25a602c45c76a7130878db72bcf6f76df04bf85","Linux >= b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 < 036322025d6e440cb75fc6fecbba9a16b271a2ae","Linux 5.16"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:02.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90108","references":[{"url":"https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.887Z","epss":0.00205,"epssPercentile":0.10894,"slug":"CVE-2026-90108","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition\n\nWhen smc_llc_event_handler() transitions the local LLC flow from\nSMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK\nrequest, it calls smc_llc_flow_qentry_set() unconditionally:\n\n\tif (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) {\n\t\tlgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK;\n\t\tsmc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry);\n\t\t...\n\t}\n\nA CONFIRM_LINK or ADD_LINK_CONT arriving while flow->type is\nSMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow->qentry via the\nSMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into\nflow->qentry for any non-NONE flow type).  When the subsequent ADD_LINK\narrives, the REQ_ADD_LINK branch overwrites flow->qentry with the new pointer\nwithout first freeing the stashed allocation, leaking one kmalloc object.\n\nThe stashed entry has no consumer: smc_llc_wait() is only called from\nllc_add_link_work, which is not yet scheduled while the flow type remains\nREQ_ADD_LINK.  No waiter is sleeping on llc_msg_waiter at this point.\nIt is safe to unconditionally free any stashed qentry before\nthe overwrite.\n\nCall smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the\nREQ_ADD_LINK branch.  smc_llc_flow_qentry_del() already checks flow->qentry\nbefore freeing, so the normal path where no entry is stashed is a no-op.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}