{
  "threat_severity" : "Important",
  "public_date" : "2026-08-10T11:59:07Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel SLIP: Out-of-bounds write due to race condition during MTU change",
    "id" : "2513218",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2513218"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-787",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnet: slip: serialize receive against buffer reallocation\nsl_realloc_bufs() replaces rbuff and updates buffsize while holding\nsl->lock. slip_receive_buf() reads those fields and writes through rbuff\nwithout holding the lock.\nAn MTU change can therefore race with receive processing. An MTU shrink\ncan expose the new smaller rbuff with the old larger bound, causing an\nout-of-bounds write. A receive callback which already loaded the old\nrbuff can instead continue writing after that buffer has been freed.\nSerialize receive processing with sl_realloc_bufs() by holding sl->lock\nwhile consuming each receive batch.", "A flaw was found in the Linux kernel's SLIP (Serial Line Internet Protocol) network component. A race condition exists during an MTU (Maximum Transmission Unit) change when the system reallocates receive buffers. This can allow a remote attacker to trigger an out-of-bounds write or write to a freed memory region, potentially leading to a denial of service or arbitrary code execution." ],
  "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" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "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 Enterprise Linux for NVIDIA 26",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/a:redhat:enterprise_linux_nvidia:"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-68143\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68143\nhttps://lore.kernel.org/linux-cve-announce/2026081000-CVE-2026-68143-d624@gregkh/T" ],
  "name" : "CVE-2026-68143",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, prevent the `slip` kernel module from loading if the SLIP protocol is not required. Create a file `/etc/modprobe.d/disable-slip.conf` with the content `blacklist slip`. Then, regenerate the initramfs using `dracut -f -v`. A system reboot is required for the changes to be fully applied. This action may impact systems relying on the SLIP protocol for network communication.",
    "lang" : "en:us"
  },
  "csaw" : false
}