{
  "threat_severity" : "Low",
  "public_date" : "2025-12-30T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: jbd2: fix potential buffer head reference count leak",
    "id" : "2426156",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2426156"
  },
  "cvss3" : {
    "cvss3_base_score" : "3.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-911",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\njbd2: fix potential buffer head reference count leak\nAs in 'jbd2_fc_wait_bufs' if buffer isn't uptodate, will return -EIO without\nupdate 'journal->j_fc_off'. But 'jbd2_fc_release_bufs' will release buffer head\nfrom ‘j_fc_off - 1’ if 'bh' is NULL will terminal release which will lead to\nbuffer head buffer head reference count leak.\nTo solve above issue, update 'journal->j_fc_off' before return -EIO.", "A buffer head reference count leak was found in the JBD2 journaling layer (used by ext4). When jbd2_fc_wait_bufs() encounters a non-uptodate buffer and returns -EIO, the journal offset is not updated, causing subsequent buffer release to skip some buffer heads." ],
  "statement" : "This affects ext4 filesystems using fast commit. The leak occurs only on I/O error paths during journaling and leads to gradual memory consumption rather than an immediate crash. Regular ext4 operation without I/O errors is unaffected.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-05-09T00:00:00Z",
    "advisory" : "RHSA-2023:2458",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-284.11.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-05-09T00:00:00Z",
    "advisory" : "RHSA-2023:2458",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-284.11.1.el9_2"
  } ],
  "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" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "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-2022-50839\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50839\nhttps://lore.kernel.org/linux-cve-announce/2025123019-CVE-2022-50839-eca8@gregkh/T" ],
  "name" : "CVE-2022-50839",
  "csaw" : false
}