ghsa-66mx-vw67-wmq9
Vulnerability from github
Published
2024-07-12 15:31
Modified
2024-09-09 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

batman-adv: bypass empty buckets in batadv_purge_orig_ref()

Many syzbot reports are pointing to soft lockups in batadv_purge_orig_ref() [1]

Root cause is unknown, but we can avoid spending too much time there and perhaps get more interesting reports.

[1]

watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u4:6:621] Modules linked in: irq event stamp: 6182794 hardirqs last enabled at (6182793): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 hardirqs last disabled at (6182794): [] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline] hardirqs last disabled at (6182794): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551 softirqs last enabled at (6182792): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (6182792): [] batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287 softirqs last disabled at (6182790): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (6182790): [] batadv_purge_orig_ref+0x164/0x1228 net/batman-adv/originator.c:1271 CPU: 0 PID: 621 Comm: kworker/u4:6 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: bat_events batadv_purge_orig pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : should_resched arch/arm64/include/asm/preempt.h:79 [inline] pc : __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:388 lr : __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 sp : ffff800099007970 x29: ffff800099007980 x28: 1fffe00018fce1bd x27: dfff800000000000 x26: ffff0000d2620008 x25: ffff0000c7e70de8 x24: 0000000000000001 x23: 1fffe00018e57781 x22: dfff800000000000 x21: ffff80008aab71c4 x20: ffff0001b40136c0 x19: ffff0000c72bbc08 x18: 1fffe0001a817bb0 x17: ffff800125414000 x16: ffff80008032116c x15: 0000000000000001 x14: 1fffe0001ee9d610 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 00000000005e5789 x7 : ffff80008aab61dc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : 0000000000000080 x0 : ffff800125414000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline] __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287 batadv_purge_orig+0x20/0x70 net/batman-adv/originator.c:1300 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:51 lr : default_idle_call+0xf8/0x128 kernel/sched/idle.c:103 sp : ffff800093a17d30 x29: ffff800093a17d30 x28: dfff800000000000 x27: 1ffff00012742fb4 x26: ffff80008ec9d000 x25: 0000000000000000 x24: 0000000000000002 x23: 1ffff00011d93a74 x22: ffff80008ec9d3a0 x21: 0000000000000000 x20: ffff0000c19dbc00 x19: ffff8000802d0fd8 x18: 1fffe00036804396 x17: ffff80008ec9d000 x16: ffff8000802d089c x15: 0000000000000001 ---truncated---

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{
   affected: [],
   aliases: [
      "CVE-2024-40981",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-667",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-07-12T13:15:19Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bypass empty buckets in batadv_purge_orig_ref()\n\nMany syzbot reports are pointing to soft lockups in\nbatadv_purge_orig_ref() [1]\n\nRoot cause is unknown, but we can avoid spending too much\ntime there and perhaps get more interesting reports.\n\n[1]\n\nwatchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u4:6:621]\nModules linked in:\nirq event stamp: 6182794\n hardirqs last  enabled at (6182793): [<ffff8000801dae10>] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386\n hardirqs last disabled at (6182794): [<ffff80008ad66a78>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]\n hardirqs last disabled at (6182794): [<ffff80008ad66a78>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551\n softirqs last  enabled at (6182792): [<ffff80008aab71c4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]\n softirqs last  enabled at (6182792): [<ffff80008aab71c4>] batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287\n softirqs last disabled at (6182790): [<ffff80008aab61dc>] spin_lock_bh include/linux/spinlock.h:356 [inline]\n softirqs last disabled at (6182790): [<ffff80008aab61dc>] batadv_purge_orig_ref+0x164/0x1228 net/batman-adv/originator.c:1271\nCPU: 0 PID: 621 Comm: kworker/u4:6 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024\nWorkqueue: bat_events batadv_purge_orig\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : should_resched arch/arm64/include/asm/preempt.h:79 [inline]\n pc : __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:388\n lr : __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386\nsp : ffff800099007970\nx29: ffff800099007980 x28: 1fffe00018fce1bd x27: dfff800000000000\nx26: ffff0000d2620008 x25: ffff0000c7e70de8 x24: 0000000000000001\nx23: 1fffe00018e57781 x22: dfff800000000000 x21: ffff80008aab71c4\nx20: ffff0001b40136c0 x19: ffff0000c72bbc08 x18: 1fffe0001a817bb0\nx17: ffff800125414000 x16: ffff80008032116c x15: 0000000000000001\nx14: 1fffe0001ee9d610 x13: 0000000000000000 x12: 0000000000000003\nx11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000\nx8 : 00000000005e5789 x7 : ffff80008aab61dc x6 : 0000000000000000\nx5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000\nx2 : 0000000000000006 x1 : 0000000000000080 x0 : ffff800125414000\nCall trace:\n  __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline]\n  arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline]\n  __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386\n  __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]\n  _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210\n  spin_unlock_bh include/linux/spinlock.h:396 [inline]\n  batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287\n  batadv_purge_orig+0x20/0x70 net/batman-adv/originator.c:1300\n  process_one_work+0x694/0x1204 kernel/workqueue.c:2633\n  process_scheduled_works kernel/workqueue.c:2706 [inline]\n  worker_thread+0x938/0xef4 kernel/workqueue.c:2787\n  kthread+0x288/0x310 kernel/kthread.c:388\n  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860\nSending NMI from CPU 0 to CPUs 1:\nNMI backtrace for cpu 1\nCPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:51\n lr : default_idle_call+0xf8/0x128 kernel/sched/idle.c:103\nsp : ffff800093a17d30\nx29: ffff800093a17d30 x28: dfff800000000000 x27: 1ffff00012742fb4\nx26: ffff80008ec9d000 x25: 0000000000000000 x24: 0000000000000002\nx23: 1ffff00011d93a74 x22: ffff80008ec9d3a0 x21: 0000000000000000\nx20: ffff0000c19dbc00 x19: ffff8000802d0fd8 x18: 1fffe00036804396\nx17: ffff80008ec9d000 x16: ffff8000802d089c x15: 0000000000000001\n---truncated---",
   id: "GHSA-66mx-vw67-wmq9",
   modified: "2024-09-09T18:30:29Z",
   published: "2024-07-12T15:31:29Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-40981",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/154e3f862ba33675cf3f4abf0a0a309a89df87d2",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/2685008a5f9a636434a8508419cee8158a2f52c8",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/40dc8ab605894acae1473e434944924a22cfaaa0",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/79636f636126775436a11ee9cf00a9253a33ac11",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/82cdea8f3af1e36543c937df963d108c60bea030",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/92176caf9896572f00e741a93cecc0ef1172da07",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/ae7f3cffe86aea3da0e8e079525a1ae619b8862a",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/fed7914858a1f1f3e6350bb0f620d6ef15107d16",
      },
   ],
   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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