{
  "threat_severity" : "Low",
  "public_date" : "2025-12-24T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel: Denial of Service in erofs due to memory leak",
    "id" : "2425151",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2425151"
  },
  "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-772",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nerofs: Fix pcluster memleak when its block address is zero\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\nunreferenced object 0xffff88811009c7f8 (size 136):\n...\nbacktrace:\n[<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740\n[<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580\n[<ffffffff814bc0d6>] read_pages+0x86/0x3d0\n...\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be\nzero although pcl is not a inline pcluster.\nThen following path adds refcount for grp, but the refcount won't be put\nbecause pcl is inline.\nz_erofs_readahead()\nz_erofs_do_read_page() # for another page\nz_erofs_collector_begin()\nerofs_find_workgroup()\nerofs_workgroup_get()\nSince it's illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked.", "A flaw was found in the Linux kernel's erofs filesystem. A local user can trigger a memory leak by exploiting a condition in the `z_erofs_register_pcluster()` function where a pcluster's block address is zero, leading to an unreleased reference count. This vulnerability can result in resource exhaustion, causing a Denial of Service (DoS) on the system." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not 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 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2022-50743\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50743\nhttps://lore.kernel.org/linux-cve-announce/2025122449-CVE-2022-50743-8e63@gregkh/T" ],
  "name" : "CVE-2022-50743",
  "csaw" : false
}