{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21719",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21719"
  ],
  "published": "2025-02-27T02:06:37Z",
  "summary": "ipmr: do not call mr_mfc_uses_dev() for unres entries",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipmr: do not call mr_mfc_uses_dev() for unres entries\n\nsyzbot found that calling mr_mfc_uses_dev() for unres entries\nwould crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif\nalias to \"struct sk_buff_head unresolved\", which contain two pointers.\n\nThis code never worked, lets remove it.\n\n[1]\nUnable to handle kernel paging request at virtual address ffff5fff2d536613\nKASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f]\nModules linked in:\nCPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline]\n pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334\n lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline]\n lr : mr_table_dump+0x694/0x8b0 net/ipv4/ipmr_base.c:334\nCall trace:\n  mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline] (P)\n  mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334 (P)\n  mr_rtm_dumproute+0x254/0x454 net/ipv4/ipmr_base.c:382\n  ipmr_rtm_dumproute+0x248/0x4b4 net/ipv4/ipmr.c:2648\n  rtnl_dump_all+0x2e4/0x4e8 net/core/rtnetlink.c:4327\n  rtnl_dumpit+0x98/0x1d0 net/core/rtnetlink.c:6791\n  netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2317\n  netlink_recvmsg+0x56c/0xe64 net/netlink/af_netlink.c:1973\n  sock_recvmsg_nosec net/socket.c:1033 [inline]\n  sock_recvmsg net/socket.c:1055 [inline]\n  sock_read_iter+0x2d8/0x40c net/socket.c:1125\n  new_sync_read fs/read_write.c:484 [inline]\n  vfs_read+0x740/0x970 fs/read_write.c:565\n  ksys_read+0x15c/0x26c fs/read_write.c:708",
  "affected": [
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21719"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfde"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}