GHSA-3P2H-8X46-GVG6

Vulnerability from github – Published: 2024-05-14 15:32 – Updated: 2026-01-22 21:33
VLAI
Details

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

Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout

There is a race condition between l2cap_chan_timeout() and l2cap_chan_del(). When we use l2cap_chan_del() to delete the channel, the chan->conn will be set to null. But the conn could be dereferenced again in the mutex_lock() of l2cap_chan_timeout(). As a result the null pointer dereference bug will happen. The KASAN report triggered by POC is shown below:

[ 472.074580] ================================================================== [ 472.075284] BUG: KASAN: null-ptr-deref in mutex_lock+0x68/0xc0 [ 472.075308] Write of size 8 at addr 0000000000000158 by task kworker/0:0/7 [ 472.075308] [ 472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36 [ 472.075308] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4 [ 472.075308] Workqueue: events l2cap_chan_timeout [ 472.075308] Call Trace: [ 472.075308] [ 472.075308] dump_stack_lvl+0x137/0x1a0 [ 472.075308] print_report+0x101/0x250 [ 472.075308] ? __virt_addr_valid+0x77/0x160 [ 472.075308] ? mutex_lock+0x68/0xc0 [ 472.075308] kasan_report+0x139/0x170 [ 472.075308] ? mutex_lock+0x68/0xc0 [ 472.075308] kasan_check_range+0x2c3/0x2e0 [ 472.075308] mutex_lock+0x68/0xc0 [ 472.075308] l2cap_chan_timeout+0x181/0x300 [ 472.075308] process_one_work+0x5d2/0xe00 [ 472.075308] worker_thread+0xe1d/0x1660 [ 472.075308] ? pr_cont_work+0x5e0/0x5e0 [ 472.075308] kthread+0x2b7/0x350 [ 472.075308] ? pr_cont_work+0x5e0/0x5e0 [ 472.075308] ? kthread_blkcg+0xd0/0xd0 [ 472.075308] ret_from_fork+0x4d/0x80 [ 472.075308] ? kthread_blkcg+0xd0/0xd0 [ 472.075308] ret_from_fork_asm+0x11/0x20 [ 472.075308] [ 472.075308] ================================================================== [ 472.094860] Disabling lock debugging due to kernel taint [ 472.096136] BUG: kernel NULL pointer dereference, address: 0000000000000158 [ 472.096136] #PF: supervisor write access in kernel mode [ 472.096136] #PF: error_code(0x0002) - not-present page [ 472.096136] PGD 0 P4D 0 [ 472.096136] Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI [ 472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Tainted: G B 6.9.0-rc5-00356-g78c0094a146b #36 [ 472.096136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4 [ 472.096136] Workqueue: events l2cap_chan_timeout [ 472.096136] RIP: 0010:mutex_lock+0x88/0xc0 [ 472.096136] Code: be 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00 74 08 48 88 [ 472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246 [ 472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865 [ 472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78 [ 472.096136] RBP: 0000000000000158 R08: ffff88800744fc7f R09: 1ffff11000e89f8f [ 472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000 [ 472.096136] R13: 0000000000000158 R14: ffff88800744fc78 R15: ffff888007405a00 [ 472.096136] FS: 0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000 [ 472.096136] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0 [ 472.096136] Call Trace: [ 472.096136] [ 472.096136] ? __die_body+0x8d/0xe0 [ 472.096136] ? page_fault_oops+0x6b8/0x9a0 [ 472.096136] ? kernelmode_fixup_or_oops+0x20c/0x2a0 [ 472.096136] ? do_user_addr_fault+0x1027/0x1340 [ 472.096136] ? _printk+0x7a/0xa0 [ 472.096136] ? mutex_lock+0x68/0xc0 [ 472.096136] ? add_taint+0x42/0xd0 [ 472.096136] ? exc_page_fault+0x6a/0x1b0 [ 472.096136] ? asm_exc_page_fault+0x26/0x30 [ 472.096136] ? mutex_lock+0x75/0xc0 [ 472.096136] ? mutex_lock+0x88/0xc0 [ 472.096136] ? mutex_lock+0x75/0xc0 [ 472.096136] l2cap_chan_timeo ---truncated---

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-27399"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-14T15:12:28Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout\n\nThere is a race condition between l2cap_chan_timeout() and\nl2cap_chan_del(). When we use l2cap_chan_del() to delete the\nchannel, the chan-\u003econn will be set to null. But the conn could\nbe dereferenced again in the mutex_lock() of l2cap_chan_timeout().\nAs a result the null pointer dereference bug will happen. The\nKASAN report triggered by POC is shown below:\n\n[  472.074580] ==================================================================\n[  472.075284] BUG: KASAN: null-ptr-deref in mutex_lock+0x68/0xc0\n[  472.075308] Write of size 8 at addr 0000000000000158 by task kworker/0:0/7\n[  472.075308]\n[  472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36\n[  472.075308] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4\n[  472.075308] Workqueue: events l2cap_chan_timeout\n[  472.075308] Call Trace:\n[  472.075308]  \u003cTASK\u003e\n[  472.075308]  dump_stack_lvl+0x137/0x1a0\n[  472.075308]  print_report+0x101/0x250\n[  472.075308]  ? __virt_addr_valid+0x77/0x160\n[  472.075308]  ? mutex_lock+0x68/0xc0\n[  472.075308]  kasan_report+0x139/0x170\n[  472.075308]  ? mutex_lock+0x68/0xc0\n[  472.075308]  kasan_check_range+0x2c3/0x2e0\n[  472.075308]  mutex_lock+0x68/0xc0\n[  472.075308]  l2cap_chan_timeout+0x181/0x300\n[  472.075308]  process_one_work+0x5d2/0xe00\n[  472.075308]  worker_thread+0xe1d/0x1660\n[  472.075308]  ? pr_cont_work+0x5e0/0x5e0\n[  472.075308]  kthread+0x2b7/0x350\n[  472.075308]  ? pr_cont_work+0x5e0/0x5e0\n[  472.075308]  ? kthread_blkcg+0xd0/0xd0\n[  472.075308]  ret_from_fork+0x4d/0x80\n[  472.075308]  ? kthread_blkcg+0xd0/0xd0\n[  472.075308]  ret_from_fork_asm+0x11/0x20\n[  472.075308]  \u003c/TASK\u003e\n[  472.075308] ==================================================================\n[  472.094860] Disabling lock debugging due to kernel taint\n[  472.096136] BUG: kernel NULL pointer dereference, address: 0000000000000158\n[  472.096136] #PF: supervisor write access in kernel mode\n[  472.096136] #PF: error_code(0x0002) - not-present page\n[  472.096136] PGD 0 P4D 0\n[  472.096136] Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI\n[  472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Tainted: G    B              6.9.0-rc5-00356-g78c0094a146b #36\n[  472.096136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4\n[  472.096136] Workqueue: events l2cap_chan_timeout\n[  472.096136] RIP: 0010:mutex_lock+0x88/0xc0\n[  472.096136] Code: be 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00 74 08 48 88\n[  472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246\n[  472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865\n[  472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78\n[  472.096136] RBP: 0000000000000158 R08: ffff88800744fc7f R09: 1ffff11000e89f8f\n[  472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000\n[  472.096136] R13: 0000000000000158 R14: ffff88800744fc78 R15: ffff888007405a00\n[  472.096136] FS:  0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000\n[  472.096136] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0\n[  472.096136] Call Trace:\n[  472.096136]  \u003cTASK\u003e\n[  472.096136]  ? __die_body+0x8d/0xe0\n[  472.096136]  ? page_fault_oops+0x6b8/0x9a0\n[  472.096136]  ? kernelmode_fixup_or_oops+0x20c/0x2a0\n[  472.096136]  ? do_user_addr_fault+0x1027/0x1340\n[  472.096136]  ? _printk+0x7a/0xa0\n[  472.096136]  ? mutex_lock+0x68/0xc0\n[  472.096136]  ? add_taint+0x42/0xd0\n[  472.096136]  ? exc_page_fault+0x6a/0x1b0\n[  472.096136]  ? asm_exc_page_fault+0x26/0x30\n[  472.096136]  ? mutex_lock+0x75/0xc0\n[  472.096136]  ? mutex_lock+0x88/0xc0\n[  472.096136]  ? mutex_lock+0x75/0xc0\n[  472.096136]  l2cap_chan_timeo\n---truncated---",
  "id": "GHSA-3p2h-8x46-gvg6",
  "modified": "2026-01-22T21:33:38Z",
  "published": "2024-05-14T15:32:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27399"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06acb75e7ed600d0bbf7bff5628aa8f24a97978c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6466ee65e5b27161c846c73ef407f49dfa1bd1d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8960ff650aec70485b40771cd8e6e8c4cb467d33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/955b5b6c54d95b5e7444dfc81c95c8e013f27ac0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adf0398cee86643b8eacde95f17d073d022f782c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e137e2ba96e51902dc2878131823a96bf8e638ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e97e16433eb4533083b096a3824b93a5ca3aee79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb86f955488c39526534211f2610e48a5cf8ead4"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DW2MIOIMOFUSNLHLRYX23AFR36BMKD65"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OTB4HWU2PTVW5NEYHHLOCXDKG3PYA534"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240926-0001"
    }
  ],
  "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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