ghsa-3959-j6xj-m4c3
Vulnerability from github
Published
2024-04-17 12:32
Modified
2024-06-27 12:30
Details

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

net/bnx2x: Prevent access to a freed page in page_pool

Fix race condition leading to system crash during EEH error handling

During EEH error recovery, the bnx2x driver's transmit timeout logic could cause a race condition when handling reset tasks. The bnx2x_tx_timeout() schedules reset tasks via bnx2x_sp_rtnl_task(), which ultimately leads to bnx2x_nic_unload(). In bnx2x_nic_unload() SGEs are freed using bnx2x_free_rx_sge_range(). However, this could overlap with the EEH driver's attempt to reset the device using bnx2x_io_slot_reset(), which also tries to free SGEs. This race condition can result in system crashes due to accessing freed memory locations in bnx2x_free_rx_sge()

799 static inline void bnx2x_free_rx_sge(struct bnx2x bp, 800 struct bnx2x_fastpath fp, u16 index) 801 { 802 struct sw_rx_page sw_buf = &fp->rx_page_ring[index]; 803 struct page page = sw_buf->page; .... where sw_buf was set to NULL after the call to dma_unmap_page() by the preceding thread.

EEH: Beginning: 'slot_reset'
PCI 0011:01:00.0#10000: EEH: Invoking bnx2x->slot_reset()
bnx2x: [bnx2x_io_slot_reset:14228(eth1)]IO slot reset initializing...
bnx2x 0011:01:00.0: enabling device (0140 -> 0142)
bnx2x: [bnx2x_io_slot_reset:14244(eth1)]IO slot reset --> driver unload
Kernel attempted to read user page (0) - exploit attempt? (uid: 0)
BUG: Kernel NULL pointer dereference on read at 0x00000000
Faulting instruction address: 0xc0080000025065fc
Oops: Kernel access of bad area, sig: 11 [#1]
.....
Call Trace:
[c000000003c67a20] [c00800000250658c] bnx2x_io_slot_reset+0x204/0x610 [bnx2x] (unreliable)
[c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0
[c000000003c67b60] [c000000000052130] eeh_pe_report+0x180/0x550
[c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60
[c000000003c67d50] [c000000000053a84] eeh_event_handler+0xf4/0x170
[c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0
[c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64

To solve this issue, we need to verify page pool allocations before freeing.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26859"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-17T11:15:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/bnx2x: Prevent access to a freed page in page_pool\n\nFix race condition leading to system crash during EEH error handling\n\nDuring EEH error recovery, the bnx2x driver\u0027s transmit timeout logic\ncould cause a race condition when handling reset tasks. The\nbnx2x_tx_timeout() schedules reset tasks via bnx2x_sp_rtnl_task(),\nwhich ultimately leads to bnx2x_nic_unload(). In bnx2x_nic_unload()\nSGEs are freed using bnx2x_free_rx_sge_range(). However, this could\noverlap with the EEH driver\u0027s attempt to reset the device using\nbnx2x_io_slot_reset(), which also tries to free SGEs. This race\ncondition can result in system crashes due to accessing freed memory\nlocations in bnx2x_free_rx_sge()\n\n799  static inline void bnx2x_free_rx_sge(struct bnx2x *bp,\n800\t\t\t\tstruct bnx2x_fastpath *fp, u16 index)\n801  {\n802\tstruct sw_rx_page *sw_buf = \u0026fp-\u003erx_page_ring[index];\n803     struct page *page = sw_buf-\u003epage;\n....\nwhere sw_buf was set to NULL after the call to dma_unmap_page()\nby the preceding thread.\n\n    EEH: Beginning: \u0027slot_reset\u0027\n    PCI 0011:01:00.0#10000: EEH: Invoking bnx2x-\u003eslot_reset()\n    bnx2x: [bnx2x_io_slot_reset:14228(eth1)]IO slot reset initializing...\n    bnx2x 0011:01:00.0: enabling device (0140 -\u003e 0142)\n    bnx2x: [bnx2x_io_slot_reset:14244(eth1)]IO slot reset --\u003e driver unload\n    Kernel attempted to read user page (0) - exploit attempt? (uid: 0)\n    BUG: Kernel NULL pointer dereference on read at 0x00000000\n    Faulting instruction address: 0xc0080000025065fc\n    Oops: Kernel access of bad area, sig: 11 [#1]\n    .....\n    Call Trace:\n    [c000000003c67a20] [c00800000250658c] bnx2x_io_slot_reset+0x204/0x610 [bnx2x] (unreliable)\n    [c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0\n    [c000000003c67b60] [c000000000052130] eeh_pe_report+0x180/0x550\n    [c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60\n    [c000000003c67d50] [c000000000053a84] eeh_event_handler+0xf4/0x170\n    [c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0\n    [c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64\n\nTo solve this issue, we need to verify page pool allocations before\nfreeing.",
  "id": "GHSA-3959-j6xj-m4c3",
  "modified": "2024-06-27T12:30:45Z",
  "published": "2024-04-17T12:32:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26859"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a9f78b297e08ca8e88ae3ecff1f6fe2766dc5eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44f9f1abb0ecc43023225ab9539167facbabf0ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f37d3a7e004bbf560c21441ca9c022168017ec4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7bcc090c81116c66936a7415f2c6b1483a4bcfd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8eebff95ce9558be66a36aa7cfb43223f3ab4699"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ffcd3ccdbda0c918c4a0f922ef1c17010f1b598"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c51f8b6930db3f259b8820b589f2459d2df3fc68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf7d8cba639ae792a42c2a137b495eac262ac36c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d27e2da94a42655861ca4baea30c8cd65546f25d"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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