{
  "threat_severity" : "Moderate",
  "public_date" : "2024-04-17T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102",
    "id" : "2275711",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2275711"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-20",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size > 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n[   99.403778] kernel BUG at mm/usercopy.c:102!\n[   99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n[   99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n[   99.415827] Call trace:\n[   99.415985]  usercopy_abort+0x70/0xa0\n[   99.416227]  __check_heap_object+0x134/0x158\n[   99.416505]  check_heap_object+0x150/0x188\n[   99.416696]  __check_object_size.part.0+0x78/0x168\n[   99.416886]  __check_object_size+0x28/0x40\n[   99.417078]  listxattr+0x8c/0x120\n[   99.417252]  path_listxattr+0x78/0xe0\n[   99.417476]  __arm64_sys_listxattr+0x28/0x40\n[   99.417723]  invoke_syscall+0x78/0x100\n[   99.417929]  el0_svc_common.constprop.0+0x48/0xf0\n[   99.418186]  do_el0_svc+0x24/0x38\n[   99.418376]  el0_svc+0x3c/0x110\n[   99.418554]  el0t_64_sync_handler+0x120/0x130\n[   99.418788]  el0t_64_sync+0x194/0x198\n[   99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\nIssue is reproduced when generic_listxattr() returns 'system.nfs4_acl',\nthus calling lisxattr() with size = 16 will trigger the bug.\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size > 0 and the return value is greater than size.", "A flaw was found in the Linux kernel. A system error can be reliably replicated with specific filesystem settings, allowing an attacker to cause a denial of service." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2024-08-08T00:00:00Z",
    "advisory" : "RHSA-2024:5102",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.16.1.rt7.357.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2024-08-08T00:00:00Z",
    "advisory" : "RHSA-2024:5101",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.16.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2024-08-07T00:00:00Z",
    "advisory" : "RHSA-2024:5065",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.6",
    "package" : "kernel-0:4.18.0-372.115.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2024-08-07T00:00:00Z",
    "advisory" : "RHSA-2024:5065",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.6",
    "package" : "kernel-0:4.18.0-372.115.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2024-08-07T00:00:00Z",
    "advisory" : "RHSA-2024:5065",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.6",
    "package" : "kernel-0:4.18.0-372.115.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Extended Update Support",
    "release_date" : "2024-08-13T00:00:00Z",
    "advisory" : "RHSA-2024:5255",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.8",
    "package" : "kernel-0:4.18.0-477.67.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-11-12T00:00:00Z",
    "advisory" : "RHSA-2024:9315",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-503.11.1.el9_5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-11-12T00:00:00Z",
    "advisory" : "RHSA-2024:9315",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-503.11.1.el9_5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Extended Update Support",
    "release_date" : "2024-11-13T00:00:00Z",
    "advisory" : "RHSA-2024:9497",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.2",
    "package" : "kernel-0:5.14.0-284.92.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Extended Update Support",
    "release_date" : "2024-11-13T00:00:00Z",
    "advisory" : "RHSA-2024:9498",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.2::nfv",
    "package" : "kernel-rt-0:5.14.0-284.92.1.rt14.377.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2024-11-13T00:00:00Z",
    "advisory" : "RHSA-2024:9546",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.44.1.el9_4"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "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"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2024-26870\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26870\nhttps://lore.kernel.org/linux-cve-announce/2024041738-CVE-2024-26870-7aea@gregkh/T" ],
  "name" : "CVE-2024-26870",
  "csaw" : false
}