{
  "threat_severity" : "Moderate",
  "public_date" : "2026-07-19T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot",
    "id" : "2502589",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2502589"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-476",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot\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.\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:\nBUG: KASAN: null-ptr-deref in _raw_spin_lock_bh+0x79/0xe0\nWrite of size 4 at addr 0000000000000068 by task exploit/144\nCall Trace:\n_raw_spin_lock_bh\nsmc_conn_create (net/smc/smc_core.c:1997)\n__smc_connect (net/smc/af_smc.c:1447)\nsmc_connect (net/smc/af_smc.c:1720)\n__sys_connect\n__x64_sys_connect\ndo_syscall_64\nRequire ism_dev[i] to be non-NULL before accepting a CHID match.", "A flaw was found in the Linux kernel's Server-Message-Block Direct (SMC-D) client. A remote attacker can exploit this vulnerability by sending a specially crafted SMC-Dv2 proposal with a Channel Identifier (CHID) of 0. This malicious proposal can cause a null pointer dereference in the kernel's SMC connection creation process, leading to a system crash and a Denial of Service (DoS)." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57254",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.157.1.rt7.498.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57253",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.157.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57252",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.41.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57252",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.41.1.el9_8"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "erlang27",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "impact" : "moderate"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-64048\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64048\nhttps://lore.kernel.org/linux-cve-announce/2026071907-CVE-2026-64048-a8e3@gregkh/T" ],
  "name" : "CVE-2026-64048",
  "csaw" : false
}