CVE-2023-54155 (GCVE-0-2023-54155)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:07 – Updated: 2025-12-24 13:07
VLAI?
Title
net: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail() Syzkaller reported the following issue: ======================================= Too BIG xdp->frame_sz = 131072 WARNING: CPU: 0 PID: 5020 at net/core/filter.c:4121 ____bpf_xdp_adjust_tail net/core/filter.c:4121 [inline] WARNING: CPU: 0 PID: 5020 at net/core/filter.c:4121 bpf_xdp_adjust_tail+0x466/0xa10 net/core/filter.c:4103 ... Call Trace: <TASK> bpf_prog_4add87e5301a4105+0x1a/0x1c __bpf_prog_run include/linux/filter.h:600 [inline] bpf_prog_run_xdp include/linux/filter.h:775 [inline] bpf_prog_run_generic_xdp+0x57e/0x11e0 net/core/dev.c:4721 netif_receive_generic_xdp net/core/dev.c:4807 [inline] do_xdp_generic+0x35c/0x770 net/core/dev.c:4866 tun_get_user+0x2340/0x3ca0 drivers/net/tun.c:1919 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2043 call_write_iter include/linux/fs.h:1871 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x650/0xe40 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd xdp->frame_sz > PAGE_SIZE check was introduced in commit c8741e2bfe87 ("xdp: Allow bpf_xdp_adjust_tail() to grow packet size"). But Jesper Dangaard Brouer <jbrouer@redhat.com> noted that after introducing the xdp_init_buff() which all XDP driver use - it's safe to remove this check. The original intend was to catch cases where XDP drivers have not been updated to use xdp.frame_sz, but that is not longer a concern (since xdp_init_buff). Running the initial syzkaller repro it was discovered that the contiguous physical memory allocation is used for both xdp paths in tun_get_user(), e.g. tun_build_skb() and tun_alloc_skb(). It was also stated by Jesper Dangaard Brouer <jbrouer@redhat.com> that XDP can work on higher order pages, as long as this is contiguous physical memory (e.g. a page).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 43b5169d8355ccf26d726fbc75f083b2429113e4 , < a09c258cfa77d3ba0a7acc555c73eb6b005c4bd8 (git)
Affected: 43b5169d8355ccf26d726fbc75f083b2429113e4 , < 20acffcdc2b74fb7dcc4e299f7aca173df89d911 (git)
Affected: 43b5169d8355ccf26d726fbc75f083b2429113e4 , < d9252d67ed2f921c230bba449ee051b5c32e4841 (git)
Affected: 43b5169d8355ccf26d726fbc75f083b2429113e4 , < d14eea09edf427fa36bd446f4a3271f99164202f (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.127 , ≤ 5.15.* (semver)
Unaffected: 6.1.46 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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-\u003eframe_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 \u003cTASK\u003e\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-\u003eframe_sz \u003e PAGE_SIZE check was introduced in commit c8741e2bfe87\n(\"xdp: Allow bpf_xdp_adjust_tail() to grow packet size\"). But Jesper\nDangaard Brouer \u003cjbrouer@redhat.com\u003e noted that after introducing the\nxdp_init_buff() which all XDP driver use - it\u0027s 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 \u003cjbrouer@redhat.com\u003e that XDP can\nwork on higher order pages, as long as this is contiguous physical\nmemory (e.g. a page)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:07:05.385Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a09c258cfa77d3ba0a7acc555c73eb6b005c4bd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/20acffcdc2b74fb7dcc4e299f7aca173df89d911"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9252d67ed2f921c230bba449ee051b5c32e4841"
        },
        {
          "url": "https://git.kernel.org/stable/c/d14eea09edf427fa36bd446f4a3271f99164202f"
        }
      ],
      "title": "net: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail()",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54155",
    "datePublished": "2025-12-24T13:07:05.385Z",
    "dateReserved": "2025-12-24T13:02:52.530Z",
    "dateUpdated": "2025-12-24T13:07:05.385Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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