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vuln-cve/data/2026/64xxx/CVE-2026-64048.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-64048",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-07-19T07:54:57.029Z",
"datePublished": "2026-07-19T15:39:32.664Z",
"dateUpdated": "2026-10-19T20:28:10.855Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-23T12:45:32.597Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The fault is triggered while processing a malicious CLC ACCEPT message received from a remote TCP peer during the SMC-D handshake; the attacker controls the server response over the network.\nAC:L - Once a victim with SMC-Dv2 hardware initiates an SMC connection, a malicious peer can reliably send `d1.chid == 0` in the CLC ACCEPT to match the empty reserved slot 0 without races or special timing.\nPR:N - No local privileges are required on the victim host; an unauthenticated remote attacker operating a malicious SMC server can crash connecting clients, and unprivileged users can create SMC sockets without capability checks.\nUI:N - Exploitation requires only that a victim application initiate a normal outbound SMC connection to the attacker's server, which occurs automatically in enterprise middleware without per-connection user action.\nS:U - The vulnerability causes a kernel crash on the victim host but does not cross a security boundary such as VM escape or sandbox breakout.\nC:N - The bug is a null pointer dereference when taking `ism_dev[0]->lgr_lock`; it causes an immediate kernel fault with no information disclosure.\nI:N - The attempted write at address 0x68 is a spinlock operation on a NULL `smcd_dev` pointer, not a controlled or arbitrary memory modification primitive.\nA:H - A successful trigger causes a kernel null pointer dereference (KASAN-reported oops/panic), crashing the affected system or at minimum the connecting process's kernel context."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/smc/af_smc.c"
],
"versions": [
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "903f7688ffeb9b323d70652c01f554bd4ba2a3d6",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "6927cacf2b10d4fa80c1a2d407512ef9397c59c6",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "53eb7bd09aace72fa17510d80e0caf5ca058c231",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "afa9036b8c9963947b487c36e332df6a42c96fcb",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e",
"status": "affected",
"versionType": "git"
},
{
"version": "a7c9c5f4af7f6098da68705fc5d86565d0728ef7",
"lessThan": "277740023def559a4a2ddc3e8e784ee37a0f16a9",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/smc/af_smc.c"
],
"versions": [
{
"version": "5.10",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.10",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.266",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.217",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.142",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.92",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.34",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.11",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "5.10.266"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "5.15.217"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "6.1.175"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "6.6.142"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "6.12.92"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "6.18.34"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "7.0.11"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10",
"versionEndExcluding": "7.1"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/903f7688ffeb9b323d70652c01f554bd4ba2a3d6"
},
{
"url": "https://git.kernel.org/stable/c/dd2f9dd83c68abd7ba7ded7075290b016cb7ecd0"
},
{
"url": "https://git.kernel.org/stable/c/6927cacf2b10d4fa80c1a2d407512ef9397c59c6"
},
{
"url": "https://git.kernel.org/stable/c/d38ba387244e5c5f7db3e11ea98bc2c7beccb0c0"
},
{
"url": "https://git.kernel.org/stable/c/53eb7bd09aace72fa17510d80e0caf5ca058c231"
},
{
"url": "https://git.kernel.org/stable/c/afa9036b8c9963947b487c36e332df6a42c96fcb"
},
{
"url": "https://git.kernel.org/stable/c/65edb3b0822cfe5041be8fbabebd57e2e5ad9f4e"
},
{
"url": "https://git.kernel.org/stable/c/277740023def559a4a2ddc3e8e784ee37a0f16a9"
}
],
"title": "net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-64048",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T15:35:56.958231Z"
}
}
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference"
}
]
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-19T20:28:10.855Z"
}
}
]
}
}
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