{
  "threat_severity" : "Moderate",
  "public_date" : "2025-07-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation",
    "id" : "2383404",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2383404"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-252",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nSquashfs: check return result of sb_min_blocksize\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs.  When this happens the following code in squashfs_fill_super()\nfails.\n----\nmsblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk->devblksize_log2 = ffz(~msblk->devblksize);\n----\nsb_min_blocksize() returns 0, which means msblk->devblksize is set to 0.\nAs a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2\nis set to 64.\nThis subsequently causes the\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type 'u64' (aka\n'unsigned long long')\nThis commit adds a check for a 0 return by sb_min_blocksize().", "A flaw was found in the Linux kernel's Squashfs filesystem. A local attacker can exploit this vulnerability by simultaneously mounting a Squashfs filesystem and issuing a specific input/output control (ioctl) command. This can lead to an incorrect block size calculation, causing a shift-out-of-bounds error. This memory corruption vulnerability can result in a denial of service or potentially lead to more severe system compromise." ],
  "statement" : "This moderate impact flaw in the Linux kernel's Squashfs filesystem is present in Red Hat Enterprise Linux 7, 8, 9, and 10, which allows a local attacker to cause a denial of service or a potential system compromise by simultaneously mounting a Squashfs filesystem and issuing a specific ioctl command, leading to an incorrect block size calculation and a shift-out-of-bounds read issue due to an incorrect function return problem.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-02-09T00:00:00Z",
    "advisory" : "RHSA-2026:2282",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "kernel-0:6.12.0-124.35.1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-03-03T00:00:00Z",
    "advisory" : "RHSA-2026:3579",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "kernel-0:6.12.0-55.62.1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-03-03T00:00:00Z",
    "advisory" : "RHSA-2026:3634",
    "cpe" : "cpe:/a:redhat:rhel_extras_rt_els:7",
    "package" : "kernel-rt-0:3.10.0-1160.147.1.rt56.1299.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-03-03T00:00:00Z",
    "advisory" : "RHSA-2026:3685",
    "cpe" : "cpe:/o:redhat:rhel_els:7",
    "package" : "kernel-0:3.10.0-1160.147.1.el7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1661",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-02-02T00:00:00Z",
    "advisory" : "RHSA-2026:1662",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.100.1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2026-02-26T00:00:00Z",
    "advisory" : "RHSA-2026:3388",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.2",
    "package" : "kernel-0:4.18.0-193.187.1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3360",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.4",
    "package" : "kernel-0:4.18.0-305.186.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3360",
    "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.4",
    "package" : "kernel-0:4.18.0-305.186.1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3268",
    "cpe" : "cpe:/o:redhat:rhel_aus:8.6",
    "package" : "kernel-0:4.18.0-372.181.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3268",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.6",
    "package" : "kernel-0:4.18.0-372.181.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3268",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.6",
    "package" : "kernel-0:4.18.0-372.181.1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3277",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.8",
    "package" : "kernel-0:4.18.0-477.130.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3277",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "kernel-0:4.18.0-477.130.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-02-09T00:00:00Z",
    "advisory" : "RHSA-2026:2212",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.30.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-02-09T00:00:00Z",
    "advisory" : "RHSA-2026:2212",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.30.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3293",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "kernel-0:5.14.0-70.167.1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3375",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0::nfv",
    "package" : "kernel-rt-0:5.14.0-70.167.1.rt21.239.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3267",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "kernel-0:5.14.0-284.158.1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-02-25T00:00:00Z",
    "advisory" : "RHSA-2026:3358",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2::nfv",
    "package" : "kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-02-17T00:00:00Z",
    "advisory" : "RHSA-2026:2766",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "kernel-0:5.14.0-427.111.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-02-23T00:00:00Z",
    "advisory" : "RHSA-2026:3088",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "kernel-0:5.14.0-570.92.1.el9_6"
  } ],
  "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 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-38415\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38415\nhttps://lore.kernel.org/linux-cve-announce/2025072513-CVE-2025-38415-c634@gregkh/T" ],
  "name" : "CVE-2025-38415",
  "csaw" : false
}