{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53726",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53726"
  ],
  "published": "2025-10-22T13:24:27Z",
  "summary": "arm64: csum: Fix OoB access in IP checksum code for negative lengths",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: csum: Fix OoB access in IP checksum code for negative lengths\n\nAlthough commit c2c24edb1d9c (\"arm64: csum: Fix pathological zero-length\ncalls\") added an early return for zero-length input, syzkaller has\npopped up with an example of a _negative_ length which causes an\nundefined shift and an out-of-bounds read:\n\n | BUG: KASAN: slab-out-of-bounds in do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n | Read of size 4294966928 at addr ffff0000d7ac0170 by task syz-executor412/5975\n |\n | CPU: 0 PID: 5975 Comm: syz-executor412 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0\n | Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023\n | Call trace:\n |  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233\n |  show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240\n |  __dump_stack lib/dump_stack.c:88 [inline]\n |  dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\n |  print_address_description mm/kasan/report.c:351 [inline]\n |  print_report+0x174/0x514 mm/kasan/report.c:462\n |  kasan_report+0xd4/0x130 mm/kasan/report.c:572\n |  kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187\n |  __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31\n |  do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n |  csum_partial+0x30/0x58 lib/checksum.c:128\n |  gso_make_checksum include/linux/skbuff.h:4928 [inline]\n |  __udp_gso_segment+0xaf4/0x1bc4 net/ipv4/udp_offload.c:332\n |  udp6_ufo_fragment+0x540/0xca0 net/ipv6/udp_offload.c:47\n |  ipv6_gso_segment+0x5cc/0x1760 net/ipv6/ip6_offload.c:119\n |  skb_mac_gso_segment+0x2b4/0x5b0 net/core/gro.c:141\n |  __skb_gso_segment+0x250/0x3d0 net/core/dev.c:3401\n |  skb_gso_segment include/linux/netdevice.h:4859 [inline]\n |  validate_xmit_skb+0x364/0xdbc net/core/dev.c:3659\n |  validate_xmit_skb_list+0x94/0x130 net/core/dev.c:3709\n |  sch_direct_xmit+0xe8/0x548 net/sched/sch_generic.c:327\n |  __dev_xmit_skb net/core/dev.c:3805 [inline]\n |  __dev_queue_xmit+0x147c/0x3318 net/core/dev.c:4210\n |  dev_queue_xmit include/linux/netdevice.h:3085 [inline]\n |  packet_xmit+0x6c/0x318 net/packet/af_packet.c:276\n |  packet_snd net/packet/af_packet.c:3081 [inline]\n |  packet_sendmsg+0x376c/0x4c98 net/packet/af_packet.c:3113\n |  sock_sendmsg_nosec net/socket.c:724 [inline]\n |  sock_sendmsg net/socket.c:747 [inline]\n |  __sys_sendto+0x3b4/0x538 net/socket.c:2144\n\nExtend the early return to reject negative lengths as well, aligning our\nimplementation with the generic code in lib/checksum.c",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1",
        "1:6.1.47-1+rpt2",
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi2-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt2"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.53"
          },
          "1:6.1.47-1+rpt2": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.53"
          },
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.53",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53726"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a85727239a23de1cc8d93985f1056308128f3e2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba0b46166b8e547024d02345a68b747841931ad2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fcdf904e866de0e3715835e50409fda3b2590527"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8bd795fedb8450ecbef18eeadbd23ed8fc7630f5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z"
  }
}