{"id":"CVE-2026-74719","summary":"net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\n\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow-\u003eqentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\n\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow-\u003eqentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\n\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow-\u003eqentry at the equivalent site and drops duplicate responses\ncorrectly.","modified":"2026-08-24T11:47:24.768362176Z","published":"2026-08-22T15:33:12.716Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74719.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74719.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74719"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0fb0b02bd6fd26cba38002be4a6bbcae2228fd44"},{"fixed":"e384f3cba6ea709f5b2272b1770db4ce14047f78"},{"fixed":"a1e980d7a9e7ee6faf4f5fd7b450413b969af26d"},{"fixed":"e0eb87677c76b157cdf8eb7c1f19e56227165a33"},{"fixed":"06734dfeaeba886aab1bf147249195b888ac3e4d"},{"fixed":"c23c409228629107203d3c3e95fff1473173f1a6"},{"fixed":"10cb31b2b74cb664c6c95cf72364d7d5c483ab82"},{"fixed":"bfc336a9fbbf09805f3dfe25c195a4db90af2846"},{"fixed":"976245094925bab9bc39366b2e9ab44ffcde61d0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74719.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.8.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74719.json"}}],"schema_version":"1.9.0"}