{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-54155",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-54155"
  ],
  "published": "2025-12-24T13:11:50Z",
  "summary": "net: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail()\n\nSyzkaller reported the following issue:\n=======================================\nToo BIG xdp->frame_sz = 131072\nWARNING: CPU: 0 PID: 5020 at net/core/filter.c:4121\n  ____bpf_xdp_adjust_tail net/core/filter.c:4121 [inline]\nWARNING: CPU: 0 PID: 5020 at net/core/filter.c:4121\n  bpf_xdp_adjust_tail+0x466/0xa10 net/core/filter.c:4103\n...\nCall Trace:\n <TASK>\n bpf_prog_4add87e5301a4105+0x1a/0x1c\n __bpf_prog_run include/linux/filter.h:600 [inline]\n bpf_prog_run_xdp include/linux/filter.h:775 [inline]\n bpf_prog_run_generic_xdp+0x57e/0x11e0 net/core/dev.c:4721\n netif_receive_generic_xdp net/core/dev.c:4807 [inline]\n do_xdp_generic+0x35c/0x770 net/core/dev.c:4866\n tun_get_user+0x2340/0x3ca0 drivers/net/tun.c:1919\n tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2043\n call_write_iter include/linux/fs.h:1871 [inline]\n new_sync_write fs/read_write.c:491 [inline]\n vfs_write+0x650/0xe40 fs/read_write.c:584\n ksys_write+0x12f/0x250 fs/read_write.c:637\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nxdp->frame_sz > PAGE_SIZE check was introduced in commit c8741e2bfe87\n(\"xdp: Allow bpf_xdp_adjust_tail() to grow packet size\"). But Jesper\nDangaard Brouer <jbrouer@redhat.com> noted that after introducing the\nxdp_init_buff() which all XDP driver use - it's safe to remove this\ncheck. The original intend was to catch cases where XDP drivers have\nnot been updated to use xdp.frame_sz, but that is not longer a concern\n(since xdp_init_buff).\n\nRunning the initial syzkaller repro it was discovered that the\ncontiguous physical memory allocation is used for both xdp paths in\ntun_get_user(), e.g. tun_build_skb() and tun_alloc_skb(). It was also\nstated by Jesper Dangaard Brouer <jbrouer@redhat.com> that XDP can\nwork on higher order pages, as long as this is contiguous physical\nmemory (e.g. a page).",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "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": "6.1.46"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-54155"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a09c258cfa77d3ba0a7acc555c73eb6b005c4bd8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20acffcdc2b74fb7dcc4e299f7aca173df89d911"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d9252d67ed2f921c230bba449ee051b5c32e4841"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d14eea09edf427fa36bd446f4a3271f99164202f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}