CVE-2024-46785 (GCVE-0-2024-46785)
Vulnerability from cvelistv5
Published
2024-09-18 07:12
Modified
2026-05-23 15:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: eventfs: Use list_del_rcu() for SRCU protected list variable Chi Zhiling reported: We found a null pointer accessing in tracefs[1], the reason is that the variable 'ei_child' is set to LIST_POISON1, that means the list was removed in eventfs_remove_rec. so when access the ei_child->is_freed, the panic triggered. by the way, the following script can reproduce this panic loop1 (){ while true do echo "p:kp submit_bio" > /sys/kernel/debug/tracing/kprobe_events echo "" > /sys/kernel/debug/tracing/kprobe_events done } loop2 (){ while true do tree /sys/kernel/debug/tracing/events/kprobes/ done } loop1 & loop2 [1]: [ 1147.959632][T17331] Unable to handle kernel paging request at virtual address dead000000000150 [ 1147.968239][T17331] Mem abort info: [ 1147.971739][T17331] ESR = 0x0000000096000004 [ 1147.976172][T17331] EC = 0x25: DABT (current EL), IL = 32 bits [ 1147.982171][T17331] SET = 0, FnV = 0 [ 1147.985906][T17331] EA = 0, S1PTW = 0 [ 1147.989734][T17331] FSC = 0x04: level 0 translation fault [ 1147.995292][T17331] Data abort info: [ 1147.998858][T17331] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 1148.005023][T17331] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 1148.010759][T17331] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 1148.016752][T17331] [dead000000000150] address between user and kernel address ranges [ 1148.024571][T17331] Internal error: Oops: 0000000096000004 [#1] SMP [ 1148.030825][T17331] Modules linked in: team_mode_loadbalance team nlmon act_gact cls_flower sch_ingress bonding tls macvlan dummy ib_core bridge stp llc veth amdgpu amdxcp mfd_core gpu_sched drm_exec drm_buddy radeon crct10dif_ce video drm_suballoc_helper ghash_ce drm_ttm_helper sha2_ce ttm sha256_arm64 i2c_algo_bit sha1_ce sbsa_gwdt cp210x drm_display_helper cec sr_mod cdrom drm_kms_helper binfmt_misc sg loop fuse drm dm_mod nfnetlink ip_tables autofs4 [last unloaded: tls] [ 1148.072808][T17331] CPU: 3 PID: 17331 Comm: ls Tainted: G W ------- ---- 6.6.43 #2 [ 1148.081751][T17331] Source Version: 21b3b386e948bedd29369af66f3e98ab01b1c650 [ 1148.088783][T17331] Hardware name: Greatwall GW-001M1A-FTF/GW-001M1A-FTF, BIOS KunLun BIOS V4.0 07/16/2020 [ 1148.098419][T17331] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 1148.106060][T17331] pc : eventfs_iterate+0x2c0/0x398 [ 1148.111017][T17331] lr : eventfs_iterate+0x2fc/0x398 [ 1148.115969][T17331] sp : ffff80008d56bbd0 [ 1148.119964][T17331] x29: ffff80008d56bbf0 x28: ffff001ff5be2600 x27: 0000000000000000 [ 1148.127781][T17331] x26: ffff001ff52ca4e0 x25: 0000000000009977 x24: dead000000000100 [ 1148.135598][T17331] x23: 0000000000000000 x22: 000000000000000b x21: ffff800082645f10 [ 1148.143415][T17331] x20: ffff001fddf87c70 x19: ffff80008d56bc90 x18: 0000000000000000 [ 1148.151231][T17331] x17: 0000000000000000 x16: 0000000000000000 x15: ffff001ff52ca4e0 [ 1148.159048][T17331] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 1148.166864][T17331] x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000804391d0 [ 1148.174680][T17331] x8 : 0000000180000000 x7 : 0000000000000018 x6 : 0000aaab04b92862 [ 1148.182498][T17331] x5 : 0000aaab04b92862 x4 : 0000000080000000 x3 : 0000000000000068 [ 1148.190314][T17331] x2 : 000000000000000f x1 : 0000000000007ea8 x0 : 0000000000000001 [ 1148.198131][T17331] Call trace: [ 1148.201259][T17331] eventfs_iterate+0x2c0/0x398 [ 1148.205864][T17331] iterate_dir+0x98/0x188 [ 1148.210036][T17331] __arm64_sys_getdents64+0x78/0x160 [ 1148.215161][T17331] invoke_syscall+0x78/0x108 [ 1148.219593][T17331] el0_svc_common.constprop.0+0x48/0xf0 [ 1148.224977][T17331] do_el0_svc+0x24/0x38 [ 1148.228974][T17331] el0_svc+0x40/0x168 [ 1148.232798][T17 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 5dfb04100326f70e3b2d2872c2476ed20b804837
Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb
Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb
Version: 5a43badefe0eccca0c26144c0a44b8d417ce8103
Version: 6.6.18   ≤
Version: 6.7.6   ≤
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                "id": "CVE-2024-46785",
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                "timestamp": "2024-09-29T14:29:25.757655Z",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Use list_del_rcu() for SRCU protected list variable\n\nChi Zhiling reported:\n\n  We found a null pointer accessing in tracefs[1], the reason is that the\n  variable \u0027ei_child\u0027 is set to LIST_POISON1, that means the list was\n  removed in eventfs_remove_rec. so when access the ei_child-\u003eis_freed, the\n  panic triggered.\n\n  by the way, the following script can reproduce this panic\n\n  loop1 (){\n      while true\n      do\n          echo \"p:kp submit_bio\" \u003e /sys/kernel/debug/tracing/kprobe_events\n          echo \"\" \u003e /sys/kernel/debug/tracing/kprobe_events\n      done\n  }\n  loop2 (){\n      while true\n      do\n          tree /sys/kernel/debug/tracing/events/kprobes/\n      done\n  }\n  loop1 \u0026\n  loop2\n\n  [1]:\n  [ 1147.959632][T17331] Unable to handle kernel paging request at virtual address dead000000000150\n  [ 1147.968239][T17331] Mem abort info:\n  [ 1147.971739][T17331]   ESR = 0x0000000096000004\n  [ 1147.976172][T17331]   EC = 0x25: DABT (current EL), IL = 32 bits\n  [ 1147.982171][T17331]   SET = 0, FnV = 0\n  [ 1147.985906][T17331]   EA = 0, S1PTW = 0\n  [ 1147.989734][T17331]   FSC = 0x04: level 0 translation fault\n  [ 1147.995292][T17331] Data abort info:\n  [ 1147.998858][T17331]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n  [ 1148.005023][T17331]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n  [ 1148.010759][T17331]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n  [ 1148.016752][T17331] [dead000000000150] address between user and kernel address ranges\n  [ 1148.024571][T17331] Internal error: Oops: 0000000096000004 [#1] SMP\n  [ 1148.030825][T17331] Modules linked in: team_mode_loadbalance team nlmon act_gact cls_flower sch_ingress bonding tls macvlan dummy ib_core bridge stp llc veth amdgpu amdxcp mfd_core gpu_sched drm_exec drm_buddy radeon crct10dif_ce video drm_suballoc_helper ghash_ce drm_ttm_helper sha2_ce ttm sha256_arm64 i2c_algo_bit sha1_ce sbsa_gwdt cp210x drm_display_helper cec sr_mod cdrom drm_kms_helper binfmt_misc sg loop fuse drm dm_mod nfnetlink ip_tables autofs4 [last unloaded: tls]\n  [ 1148.072808][T17331] CPU: 3 PID: 17331 Comm: ls Tainted: G        W         ------- ----  6.6.43 #2\n  [ 1148.081751][T17331] Source Version: 21b3b386e948bedd29369af66f3e98ab01b1c650\n  [ 1148.088783][T17331] Hardware name: Greatwall GW-001M1A-FTF/GW-001M1A-FTF, BIOS KunLun BIOS V4.0 07/16/2020\n  [ 1148.098419][T17331] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  [ 1148.106060][T17331] pc : eventfs_iterate+0x2c0/0x398\n  [ 1148.111017][T17331] lr : eventfs_iterate+0x2fc/0x398\n  [ 1148.115969][T17331] sp : ffff80008d56bbd0\n  [ 1148.119964][T17331] x29: ffff80008d56bbf0 x28: ffff001ff5be2600 x27: 0000000000000000\n  [ 1148.127781][T17331] x26: ffff001ff52ca4e0 x25: 0000000000009977 x24: dead000000000100\n  [ 1148.135598][T17331] x23: 0000000000000000 x22: 000000000000000b x21: ffff800082645f10\n  [ 1148.143415][T17331] x20: ffff001fddf87c70 x19: ffff80008d56bc90 x18: 0000000000000000\n  [ 1148.151231][T17331] x17: 0000000000000000 x16: 0000000000000000 x15: ffff001ff52ca4e0\n  [ 1148.159048][T17331] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n  [ 1148.166864][T17331] x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000804391d0\n  [ 1148.174680][T17331] x8 : 0000000180000000 x7 : 0000000000000018 x6 : 0000aaab04b92862\n  [ 1148.182498][T17331] x5 : 0000aaab04b92862 x4 : 0000000080000000 x3 : 0000000000000068\n  [ 1148.190314][T17331] x2 : 000000000000000f x1 : 0000000000007ea8 x0 : 0000000000000001\n  [ 1148.198131][T17331] Call trace:\n  [ 1148.201259][T17331]  eventfs_iterate+0x2c0/0x398\n  [ 1148.205864][T17331]  iterate_dir+0x98/0x188\n  [ 1148.210036][T17331]  __arm64_sys_getdents64+0x78/0x160\n  [ 1148.215161][T17331]  invoke_syscall+0x78/0x108\n  [ 1148.219593][T17331]  el0_svc_common.constprop.0+0x48/0xf0\n  [ 1148.224977][T17331]  do_el0_svc+0x24/0x38\n  [ 1148.228974][T17331]  el0_svc+0x40/0x168\n  [ 1148.232798][T17\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:53:32.437Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/05e08297c3c298d8ec28e5a5adb55840312dd87e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f579d17a86448779f9642ad8baca6e3036a8e2d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2603279c7d645bf0d11fa253b23f1ab48fc8d3c"
        }
      ],
      "title": "eventfs: Use list_del_rcu() for SRCU protected list variable",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-46785",
    "datePublished": "2024-09-18T07:12:41.529Z",
    "dateReserved": "2024-09-11T15:12:18.277Z",
    "dateUpdated": "2026-05-23T15:53:32.437Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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