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GHSA-MH27-4Q3P-7MC8

Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2025-11-03 21:33
VLAI
Details

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

RDMA/core: Don't expose hw_counters outside of init net namespace

Commit 467f432a521a ("RDMA/core: Split port and device counter sysfs attributes") accidentally almost exposed hw counters to non-init net namespaces. It didn't expose them fully, as an attempt to read any of those counters leads to a crash like this one:

[42021.807566] BUG: kernel NULL pointer dereference, address: 0000000000000028 [42021.814463] #PF: supervisor read access in kernel mode [42021.819549] #PF: error_code(0x0000) - not-present page [42021.824636] PGD 0 P4D 0 [42021.827145] Oops: 0000 [#1] SMP PTI [42021.830598] CPU: 82 PID: 2843922 Comm: switchto-defaul Kdump: loaded Tainted: G S W I XXX [42021.841697] Hardware name: XXX [42021.849619] RIP: 0010:hw_stat_device_show+0x1e/0x40 [ib_core] [42021.855362] Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 49 89 d0 4c 8b 5e 20 48 8b 8f b8 04 00 00 48 81 c7 f0 fa ff ff <48> 8b 41 28 48 29 ce 48 83 c6 d0 48 c1 ee 04 69 d6 ab aa aa aa 48 [42021.873931] RSP: 0018:ffff97fe90f03da0 EFLAGS: 00010287 [42021.879108] RAX: ffff9406988a8c60 RBX: ffff940e1072d438 RCX: 0000000000000000 [42021.886169] RDX: ffff94085f1aa000 RSI: ffff93c6cbbdbcb0 RDI: ffff940c7517aef0 [42021.893230] RBP: ffff97fe90f03e70 R08: ffff94085f1aa000 R09: 0000000000000000 [42021.900294] R10: ffff94085f1aa000 R11: ffffffffc0775680 R12: ffffffff87ca2530 [42021.907355] R13: ffff940651602840 R14: ffff93c6cbbdbcb0 R15: ffff94085f1aa000 [42021.914418] FS: 00007fda1a3b9700(0000) GS:ffff94453fb80000(0000) knlGS:0000000000000000 [42021.922423] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [42021.928130] CR2: 0000000000000028 CR3: 00000042dcfb8003 CR4: 00000000003726f0 [42021.935194] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [42021.942257] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [42021.949324] Call Trace: [42021.951756] [42021.953842] [] ? show_regs+0x64/0x70 [42021.959030] [] ? __die+0x78/0xc0 [42021.963874] [] ? page_fault_oops+0x2b5/0x3b0 [42021.969749] [] ? exc_page_fault+0x1a2/0x3c0 [42021.975549] [] ? asm_exc_page_fault+0x26/0x30 [42021.981517] [] ? __pfx_show_hw_stats+0x10/0x10 [ib_core] [42021.988482] [] ? hw_stat_device_show+0x1e/0x40 [ib_core] [42021.995438] [] dev_attr_show+0x1e/0x50 [42022.000803] [] sysfs_kf_seq_show+0x81/0xe0 [42022.006508] [] seq_read_iter+0xf4/0x410 [42022.011954] [] vfs_read+0x16e/0x2f0 [42022.017058] [] ksys_read+0x6e/0xe0 [42022.022073] [] do_syscall_64+0x6a/0xa0 [42022.027441] [] entry_SYSCALL_64_after_hwframe+0x78/0xe2

The problem can be reproduced using the following steps: ip netns add foo ip netns exec foo bash cat /sys/class/infiniband/mlx4_0/hw_counters/*

The panic occurs because of casting the device pointer into an ib_device pointer using container_of() in hw_stat_device_show() is wrong and leads to a memory corruption.

However the real problem is that hw counters should never been exposed outside of the non-init net namespace.

Fix this by saving the index of the corresponding attribute group (it might be 1 or 2 depending on the presence of driver-specific attributes) and zeroing the pointer to hw_counters group for compat devices during the initialization.

With this fix applied hw_counters are not available in a non-init net namespace: find /sys/class/infiniband/mlx4_0/ -name hw_counters /sys/class/infiniband/mlx4_0/ports/1/hw_counters /sys/class/infiniband/mlx4_0/ports/2/hw_counters /sys/class/infiniband/mlx4_0/hw_counters

ip netns add foo ip netns exec foo bash find /sys/class/infiniband/mlx4_0/ -name hw_counters

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-22089"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:16:03Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Don\u0027t expose hw_counters outside of init net namespace\n\nCommit 467f432a521a (\"RDMA/core: Split port and device counter sysfs\nattributes\") accidentally almost exposed hw counters to non-init net\nnamespaces. It didn\u0027t expose them fully, as an attempt to read any of\nthose counters leads to a crash like this one:\n\n[42021.807566] BUG: kernel NULL pointer dereference, address: 0000000000000028\n[42021.814463] #PF: supervisor read access in kernel mode\n[42021.819549] #PF: error_code(0x0000) - not-present page\n[42021.824636] PGD 0 P4D 0\n[42021.827145] Oops: 0000 [#1] SMP PTI\n[42021.830598] CPU: 82 PID: 2843922 Comm: switchto-defaul Kdump: loaded Tainted: G S      W I        XXX\n[42021.841697] Hardware name: XXX\n[42021.849619] RIP: 0010:hw_stat_device_show+0x1e/0x40 [ib_core]\n[42021.855362] Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 49 89 d0 4c 8b 5e 20 48 8b 8f b8 04 00 00 48 81 c7 f0 fa ff ff \u003c48\u003e 8b 41 28 48 29 ce 48 83 c6 d0 48 c1 ee 04 69 d6 ab aa aa aa 48\n[42021.873931] RSP: 0018:ffff97fe90f03da0 EFLAGS: 00010287\n[42021.879108] RAX: ffff9406988a8c60 RBX: ffff940e1072d438 RCX: 0000000000000000\n[42021.886169] RDX: ffff94085f1aa000 RSI: ffff93c6cbbdbcb0 RDI: ffff940c7517aef0\n[42021.893230] RBP: ffff97fe90f03e70 R08: ffff94085f1aa000 R09: 0000000000000000\n[42021.900294] R10: ffff94085f1aa000 R11: ffffffffc0775680 R12: ffffffff87ca2530\n[42021.907355] R13: ffff940651602840 R14: ffff93c6cbbdbcb0 R15: ffff94085f1aa000\n[42021.914418] FS:  00007fda1a3b9700(0000) GS:ffff94453fb80000(0000) knlGS:0000000000000000\n[42021.922423] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[42021.928130] CR2: 0000000000000028 CR3: 00000042dcfb8003 CR4: 00000000003726f0\n[42021.935194] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[42021.942257] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[42021.949324] Call Trace:\n[42021.951756]  \u003cTASK\u003e\n[42021.953842]  [\u003cffffffff86c58674\u003e] ? show_regs+0x64/0x70\n[42021.959030]  [\u003cffffffff86c58468\u003e] ? __die+0x78/0xc0\n[42021.963874]  [\u003cffffffff86c9ef75\u003e] ? page_fault_oops+0x2b5/0x3b0\n[42021.969749]  [\u003cffffffff87674b92\u003e] ? exc_page_fault+0x1a2/0x3c0\n[42021.975549]  [\u003cffffffff87801326\u003e] ? asm_exc_page_fault+0x26/0x30\n[42021.981517]  [\u003cffffffffc0775680\u003e] ? __pfx_show_hw_stats+0x10/0x10 [ib_core]\n[42021.988482]  [\u003cffffffffc077564e\u003e] ? hw_stat_device_show+0x1e/0x40 [ib_core]\n[42021.995438]  [\u003cffffffff86ac7f8e\u003e] dev_attr_show+0x1e/0x50\n[42022.000803]  [\u003cffffffff86a3eeb1\u003e] sysfs_kf_seq_show+0x81/0xe0\n[42022.006508]  [\u003cffffffff86a11134\u003e] seq_read_iter+0xf4/0x410\n[42022.011954]  [\u003cffffffff869f4b2e\u003e] vfs_read+0x16e/0x2f0\n[42022.017058]  [\u003cffffffff869f50ee\u003e] ksys_read+0x6e/0xe0\n[42022.022073]  [\u003cffffffff8766f1ca\u003e] do_syscall_64+0x6a/0xa0\n[42022.027441]  [\u003cffffffff8780013b\u003e] entry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nThe problem can be reproduced using the following steps:\n  ip netns add foo\n  ip netns exec foo bash\n  cat /sys/class/infiniband/mlx4_0/hw_counters/*\n\nThe panic occurs because of casting the device pointer into an\nib_device pointer using container_of() in hw_stat_device_show() is\nwrong and leads to a memory corruption.\n\nHowever the real problem is that hw counters should never been exposed\noutside of the non-init net namespace.\n\nFix this by saving the index of the corresponding attribute group\n(it might be 1 or 2 depending on the presence of driver-specific\nattributes) and zeroing the pointer to hw_counters group for compat\ndevices during the initialization.\n\nWith this fix applied hw_counters are not available in a non-init\nnet namespace:\n  find /sys/class/infiniband/mlx4_0/ -name hw_counters\n    /sys/class/infiniband/mlx4_0/ports/1/hw_counters\n    /sys/class/infiniband/mlx4_0/ports/2/hw_counters\n    /sys/class/infiniband/mlx4_0/hw_counters\n\n  ip netns add foo\n  ip netns exec foo bash\n  find /sys/class/infiniband/mlx4_0/ -name hw_counters",
  "id": "GHSA-mh27-4q3p-7mc8",
  "modified": "2025-11-03T21:33:37Z",
  "published": "2025-04-16T15:34:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22089"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cf80f924aecb5b2bebd4f4ad11b2efc676a0b78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6682da5d8fd578a5068531d01633c9d2e4c8f12b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a5b7f8842a90a5e6eeff37f9f6d814e61ea3529"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1ecb30f90856b0be4168ad51b8875148e285c1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c14d9704f5d77a7c7fa46e2114b64a4f75b64e17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5212b99649c5740154f307e9e3d7fee9bf62773"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df45ae2a4f1cdfda00c032839e12092e1f32c05e"
    },
    {
      "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:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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