{"id":"CVE-2026-90107","published":"2026-09-17T17:17:02.570","lastModified":"2026-09-17T17:17:02.570","description":"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(&lgr->llc_flow_lock);\n\tmemset(flow, 0, sizeof(*flow));\n\tflow->type = SMC_LLC_FLOW_NONE;\n\tspin_unlock_bh(&lgr->llc_flow_lock);\n\nIf flow->qentry 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->qentry after the legitimate message has been consumed by the waiter via\nsmc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow->type\nnon-zero) but before the flow completes and smc_llc_flow_stop() runs.  In that\nwindow the duplicate is stashed into flow->qentry, 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->qentry before freeing, so the\nnormal case where no entry is pending is a no-op.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/032aec7d03c9102616b98fea74f8f7145e7f867c","tags":[]},{"url":"https://git.kernel.org/stable/c/0879ea157acc1ac6752f6fcb755d1f91a2359238","tags":[]},{"url":"https://git.kernel.org/stable/c/11bc373ee6630709f0c2da2e7860c23d503c9e9d","tags":[]},{"url":"https://git.kernel.org/stable/c/5ee0ceddc7785c6dcf4a8107fef01f0414a354f4","tags":[]},{"url":"https://git.kernel.org/stable/c/5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b","tags":[]},{"url":"https://git.kernel.org/stable/c/8e3deb150a5237b672c4579e69a6deb02027dbed","tags":[]},{"url":"https://git.kernel.org/stable/c/957dba2b8b5aebfe09caa6a6b22b958079082eab","tags":[]},{"url":"https://git.kernel.org/stable/c/f03aa5d36ae3c4068a1c3885146be99aa7fd9307","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}