GHSA-G779-V36V-3W99

Vulnerability from github – Published: 2025-03-27 15:31 – Updated: 2026-07-14 15:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()

KMSAN reported a use-after-free issue in eth_skb_pkt_type()[1]. The cause of the issue was that eth_skb_pkt_type() accessed skb's data that didn't contain an Ethernet header. This occurs when bpf_prog_test_run_xdp() passes an invalid value as the user_data argument to bpf_test_init().

Fix this by returning an error when user_data is less than ETH_HLEN in bpf_test_init(). Additionally, remove the check for "if (user_size > size)" as it is unnecessary.

[1] BUG: KMSAN: use-after-free in eth_skb_pkt_type include/linux/etherdevice.h:627 [inline] BUG: KMSAN: use-after-free in eth_type_trans+0x4ee/0x980 net/ethernet/eth.c:165 eth_skb_pkt_type include/linux/etherdevice.h:627 [inline] eth_type_trans+0x4ee/0x980 net/ethernet/eth.c:165 __xdp_build_skb_from_frame+0x5a8/0xa50 net/core/xdp.c:635 xdp_recv_frames net/bpf/test_run.c:272 [inline] xdp_test_run_batch net/bpf/test_run.c:361 [inline] bpf_test_run_xdp_live+0x2954/0x3330 net/bpf/test_run.c:390 bpf_prog_test_run_xdp+0x148e/0x1b10 net/bpf/test_run.c:1318 bpf_prog_test_run+0x5b7/0xa30 kernel/bpf/syscall.c:4371 __sys_bpf+0x6a6/0xe20 kernel/bpf/syscall.c:5777 __do_sys_bpf kernel/bpf/syscall.c:5866 [inline] __se_sys_bpf kernel/bpf/syscall.c:5864 [inline] __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:5864 x64_sys_call+0x2ea0/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at: free_pages_prepare mm/page_alloc.c:1056 [inline] free_unref_page+0x156/0x1320 mm/page_alloc.c:2657 __free_pages+0xa3/0x1b0 mm/page_alloc.c:4838 bpf_ringbuf_free kernel/bpf/ringbuf.c:226 [inline] ringbuf_map_free+0xff/0x1e0 kernel/bpf/ringbuf.c:235 bpf_map_free kernel/bpf/syscall.c:838 [inline] bpf_map_free_deferred+0x17c/0x310 kernel/bpf/syscall.c:862 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa2b/0x1b60 kernel/workqueue.c:3310 worker_thread+0xedf/0x1550 kernel/workqueue.c:3391 kthread+0x535/0x6b0 kernel/kthread.c:389 ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

CPU: 1 UID: 0 PID: 17276 Comm: syz.1.16450 Not tainted 6.12.0-05490-g9bb88c659673 #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-21867"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-27T14:15:47Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()\n\nKMSAN reported a use-after-free issue in eth_skb_pkt_type()[1]. The\ncause of the issue was that eth_skb_pkt_type() accessed skb\u0027s data\nthat didn\u0027t contain an Ethernet header. This occurs when\nbpf_prog_test_run_xdp() passes an invalid value as the user_data\nargument to bpf_test_init().\n\nFix this by returning an error when user_data is less than ETH_HLEN in\nbpf_test_init(). Additionally, remove the check for \"if (user_size \u003e\nsize)\" as it is unnecessary.\n\n[1]\nBUG: KMSAN: use-after-free in eth_skb_pkt_type include/linux/etherdevice.h:627 [inline]\nBUG: KMSAN: use-after-free in eth_type_trans+0x4ee/0x980 net/ethernet/eth.c:165\n eth_skb_pkt_type include/linux/etherdevice.h:627 [inline]\n eth_type_trans+0x4ee/0x980 net/ethernet/eth.c:165\n __xdp_build_skb_from_frame+0x5a8/0xa50 net/core/xdp.c:635\n xdp_recv_frames net/bpf/test_run.c:272 [inline]\n xdp_test_run_batch net/bpf/test_run.c:361 [inline]\n bpf_test_run_xdp_live+0x2954/0x3330 net/bpf/test_run.c:390\n bpf_prog_test_run_xdp+0x148e/0x1b10 net/bpf/test_run.c:1318\n bpf_prog_test_run+0x5b7/0xa30 kernel/bpf/syscall.c:4371\n __sys_bpf+0x6a6/0xe20 kernel/bpf/syscall.c:5777\n __do_sys_bpf kernel/bpf/syscall.c:5866 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5864 [inline]\n __x64_sys_bpf+0xa4/0xf0 kernel/bpf/syscall.c:5864\n x64_sys_call+0x2ea0/0x3d90 arch/x86/include/generated/asm/syscalls_64.h:322\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xd9/0x1d0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n free_pages_prepare mm/page_alloc.c:1056 [inline]\n free_unref_page+0x156/0x1320 mm/page_alloc.c:2657\n __free_pages+0xa3/0x1b0 mm/page_alloc.c:4838\n bpf_ringbuf_free kernel/bpf/ringbuf.c:226 [inline]\n ringbuf_map_free+0xff/0x1e0 kernel/bpf/ringbuf.c:235\n bpf_map_free kernel/bpf/syscall.c:838 [inline]\n bpf_map_free_deferred+0x17c/0x310 kernel/bpf/syscall.c:862\n process_one_work kernel/workqueue.c:3229 [inline]\n process_scheduled_works+0xa2b/0x1b60 kernel/workqueue.c:3310\n worker_thread+0xedf/0x1550 kernel/workqueue.c:3391\n kthread+0x535/0x6b0 kernel/kthread.c:389\n ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nCPU: 1 UID: 0 PID: 17276 Comm: syz.1.16450 Not tainted 6.12.0-05490-g9bb88c659673 #8\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014",
  "id": "GHSA-g779-v36v-3w99",
  "modified": "2026-07-14T15:31:19Z",
  "published": "2025-03-27T15:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21867"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a9e1284e87d59b1303b69d1808d310821d6e5f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b3d638ca897e099fa99bd6d02189d3176f80a47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/972bafed67ca73ad9a56448384281eb5fd5c0ba3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d56d8a23d95100b65f40438639dd82db2af81c11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f615fccfc689cb48977d275ac2e391297b52392b"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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