{
  "threat_severity" : "Moderate",
  "public_date" : "2025-02-26T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: sfc: fix use after free when disabling sriov",
    "id" : "2348032",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2348032"
  },
  "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"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nsfc: fix use after free when disabling sriov\nUse after free is detected by kfence when disabling sriov. What was read\nafter being freed was vf->pci_dev: it was freed from pci_disable_sriov\nand later read in efx_ef10_sriov_free_vf_vports, called from\nefx_ef10_sriov_free_vf_vswitching.\nSet the pointer to NULL at release time to not trying to read it later.\nReproducer and dmesg log (note that kfence doesn't detect it every time):\n$ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n$ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\nBUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\nUse-after-free read at 0x00000000ff3c1ba5 (in kfence-#224):\nefx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\nefx_ef10_pci_sriov_disable+0x38/0x70 [sfc]\nefx_pci_sriov_configure+0x24/0x40 [sfc]\nsriov_numvfs_store+0xfe/0x140\nkernfs_fop_write_iter+0x11c/0x1b0\nnew_sync_write+0x11f/0x1b0\nvfs_write+0x1eb/0x280\nksys_write+0x5f/0xe0\ndo_syscall_64+0x5c/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nkfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k\nallocated by task 6771 on cpu 10 at 3137.860196s:\npci_alloc_dev+0x21/0x60\npci_iov_add_virtfn+0x2a2/0x320\nsriov_enable+0x212/0x3e0\nefx_ef10_sriov_configure+0x67/0x80 [sfc]\nefx_pci_sriov_configure+0x24/0x40 [sfc]\nsriov_numvfs_store+0xba/0x140\nkernfs_fop_write_iter+0x11c/0x1b0\nnew_sync_write+0x11f/0x1b0\nvfs_write+0x1eb/0x280\nksys_write+0x5f/0xe0\ndo_syscall_64+0x5c/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nfreed by task 6771 on cpu 12 at 3170.991309s:\ndevice_release+0x34/0x90\nkobject_cleanup+0x3a/0x130\npci_iov_remove_virtfn+0xd9/0x120\nsriov_disable+0x30/0xe0\nefx_ef10_pci_sriov_disable+0x57/0x70 [sfc]\nefx_pci_sriov_configure+0x24/0x40 [sfc]\nsriov_numvfs_store+0xfe/0x140\nkernfs_fop_write_iter+0x11c/0x1b0\nnew_sync_write+0x11f/0x1b0\nvfs_write+0x1eb/0x280\nksys_write+0x5f/0xe0\ndo_syscall_64+0x5c/0x80\nentry_SYSCALL_64_after_hwframe+0x44/0xae" ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2022-11-08T00:00:00Z",
    "advisory" : "RHSA-2022:7683",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-425.3.1.el8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2022-11-15T00:00:00Z",
    "advisory" : "RHSA-2022:8267",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-162.6.1.el9_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2022-11-15T00:00:00Z",
    "advisory" : "RHSA-2022:8267",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-162.6.1.el9_1"
  } ],
  "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" : "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 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-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2022-49626\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49626\nhttps://lore.kernel.org/linux-cve-announce/2025022616-CVE-2022-49626-e785@gregkh/T" ],
  "name" : "CVE-2022-49626",
  "csaw" : false
}