{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-64541", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64541", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-07-27T20:10:34.439Z", "updatedAt": "2026-10-19T20:48:39.587Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket\n\nsmc_cdc_rx_handler() looks up the connection by token under the link\ngroup's conns_lock, drops the lock, and then dereferences conn and the\nsmc_sock derived from it, ending in sock_hold(&smc->sk) inside\nsmc_cdc_msg_recv(). No reference is held across the lock release.\n\nThe only reference pinning the socket while the connection is\ndiscoverable in the link group is taken in smc_lgr_register_conn()\n(sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both\nunder conns_lock. Once the handler drops conns_lock, a concurrent\nclose() -> smc_release() -> smc_conn_free() -> smc_lgr_unregister_conn()\ncan drop that reference and free the smc_sock, so the handler's later\nsock_hold() runs on freed memory:\n\n WARNING: lib/refcount.c:25 at refcount_warn_saturate\n Workqueue: rxe_wq do_work\n refcount_warn_saturate (lib/refcount.c:25)\n smc_cdc_msg_recv (net/smc/smc_cdc.c:430)\n smc_cdc_rx_handler (net/smc/smc_cdc.c:502)\n smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)\n tasklet_action_common (kernel/softirq.c:938)\n handle_softirqs (kernel/softirq.c:622)\n Kernel panic - not syncing: panic_on_warn set\n\nOnly SMC-R is affected. The SMC-D receive tasklet is stopped by\ntasklet_kill(&conn->rx_tsklet) in smc_conn_free() before the connection\nis unregistered, so it cannot run concurrently with the free.\n\nTake the socket reference while still holding conns_lock, so the\nregistration reference can no longer be the last one, and drop it once\nthe handler is done.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "8de4f665d0febfb92803dece377791a563fc7041" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "8145b432136285e01091815b48ceb2dae261f262" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "1951bffbc6493ec34cff3956b29d4bc6606904a6" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "647b19e5cc145a2f1f685ae8ff3805a17356888c" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "472e9d7c0d5b03be3ff91ff941f57da822b031bc" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "3bfb96d9bc6a7ed0b99c7db329cc2e22a28d84bb" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "ce5aa8084329351086894aa34d77e40301d5bd3d" }, { "version": "d7b0e37c1ac152905b18a5b9506179091a35b0b6", "status": "affected", "versionType": "git", "lessThan": "9d160b35cc34a2ba8229d07651468a7848325135" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.18" }, { "version": "5.10.261", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.212", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.178", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.145", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.97", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.40", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }