{"id":"CVE-2026-64048","revision":"52adc7f0f4e44be99ac36cc96d91c2ba","records":[{"revision":"52adc7f0f4e44be99ac36cc96d91c2ba","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64048","aliases":[],"title":"net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot\n\nOn the SMC-D client, slot 0 of ini->ism_dev[]/ini->ism_chid[] is\nreserved for an SMC-Dv1 device. smc_find_ism_v2_device_clnt()\npopulates V2 entries starting at index 1, so when no V1 device is\nselected slot 0 is left in its kzalloc()'ed state with ism_dev[0] ==\nNULL and ism_chid[0] == 0.\n\nsmc_v2_determine_accepted_chid() then matches the peer's CHID against\nthe array starting from index 0 using the CHID alone. A malicious\npeer replying to a SMC-Dv2-only proposal with d1.chid == 0 matches\nthe empty slot, ini->ism_selected becomes 0, and the subsequent\nism_dev[0]->lgr_lock dereference in smc_conn_create() faults at\noffsetof(struct smcd_dev, lgr_lock) == 0x68:\n\n BUG: KASAN: null-ptr-deref in _raw_spin_lock_bh+0x79/0xe0\n Write of size 4 at addr 0000000000000068 by task exploit/144\n Call Trace:\n _raw_spin_lock_bh\n smc_conn_create (net/smc/smc_core.c:1997)\n __smc_connect (net/smc/af_smc.c:1447)\n smc_connect (net/smc/af_smc.c:1720)\n __sys_connect\n __x64_sys_connect\n do_syscall_64\n\nRequire ism_dev[i] to be non-NULL before accepting a CHID match.","state":0,"publishedAt":"2026-07-19T15:39:32.664+00:00","modifiedAt":"2026-10-19T20:28:10.855+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/smc/af_smc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"903f7688ffeb9b323d70652c01f554bd4ba2a3d6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"6927cacf2b10d4fa80c1a2d407512ef9397c59c6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"53eb7bd09aace72fa17510d80e0caf5ca058c231\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"afa9036b8c9963947b487c36e332df6a42c96fcb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a7c9c5f4af7f6098da68705fc5d86565d0728ef7\",\n \"lessThan\": \"277740023def559a4a2ddc3e8e784ee37a0f16a9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/smc/af_smc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.266\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.217\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.142\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.92\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.34\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.11\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/903f7688ffeb9b323d70652c01f554bd4ba2a3d6","https://git.kernel.org/stable/c/dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0","https://git.kernel.org/stable/c/6927cacf2b10d4fa80c1a2d407512ef9397c59c6","https://git.kernel.org/stable/c/d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0","https://git.kernel.org/stable/c/53eb7bd09aace72fa17510d80e0caf5ca058c231","https://git.kernel.org/stable/c/afa9036b8c9963947b487c36e332df6a42c96fcb","https://git.kernel.org/stable/c/65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e","https://git.kernel.org/stable/c/277740023def559a4a2ddc3e8e784ee37a0f16a9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64048","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64048","identifiers":["CVE-2026-64048"]},"retained":false,"historicalAffected":[]}],"coverage":[]}