CVE-2022-49407 (GCVE-0-2022-49407)
Vulnerability from cvelistv5
Published
2025-02-26 02:12
Modified
2026-08-05 08:55
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dlm: fix plock invalid read This patch fixes an invalid read showed by KASAN. A unlock will allocate a "struct plock_op" and a followed send_op() will append it to a global send_list data structure. In some cases a followed dev_read() moves it to recv_list and dev_write() will cast it to "struct plock_xop" and access fields which are only available in those structures. At this point an invalid read happens by accessing those fields. To fix this issue the "callback" field is moved to "struct plock_op" to indicate that a cast to "plock_xop" is allowed and does the additional "plock_xop" handling if set. Example of the KASAN output which showed the invalid read: [ 2064.296453] ================================================================== [ 2064.304852] BUG: KASAN: slab-out-of-bounds in dev_write+0x52b/0x5a0 [dlm] [ 2064.306491] Read of size 8 at addr ffff88800ef227d8 by task dlm_controld/7484 [ 2064.308168] [ 2064.308575] CPU: 0 PID: 7484 Comm: dlm_controld Kdump: loaded Not tainted 5.14.0+ #9 [ 2064.310292] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 [ 2064.311618] Call Trace: [ 2064.312218] dump_stack_lvl+0x56/0x7b [ 2064.313150] print_address_description.constprop.8+0x21/0x150 [ 2064.314578] ? dev_write+0x52b/0x5a0 [dlm] [ 2064.315610] ? dev_write+0x52b/0x5a0 [dlm] [ 2064.316595] kasan_report.cold.14+0x7f/0x11b [ 2064.317674] ? dev_write+0x52b/0x5a0 [dlm] [ 2064.318687] dev_write+0x52b/0x5a0 [dlm] [ 2064.319629] ? dev_read+0x4a0/0x4a0 [dlm] [ 2064.320713] ? bpf_lsm_kernfs_init_security+0x10/0x10 [ 2064.321926] vfs_write+0x17e/0x930 [ 2064.322769] ? __fget_light+0x1aa/0x220 [ 2064.323753] ksys_write+0xf1/0x1c0 [ 2064.324548] ? __ia32_sys_read+0xb0/0xb0 [ 2064.325464] do_syscall_64+0x3a/0x80 [ 2064.326387] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 2064.327606] RIP: 0033:0x7f807e4ba96f [ 2064.328470] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 39 87 f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 87 f8 ff 48 [ 2064.332902] RSP: 002b:00007ffd50cfe6e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 2064.334658] RAX: ffffffffffffffda RBX: 000055cc3886eb30 RCX: 00007f807e4ba96f [ 2064.336275] RDX: 0000000000000040 RSI: 00007ffd50cfe7e0 RDI: 0000000000000010 [ 2064.337980] RBP: 00007ffd50cfe7e0 R08: 0000000000000000 R09: 0000000000000001 [ 2064.339560] R10: 000055cc3886eb30 R11: 0000000000000293 R12: 000055cc3886eb80 [ 2064.341237] R13: 000055cc3886eb00 R14: 000055cc3886f590 R15: 0000000000000001 [ 2064.342857] [ 2064.343226] Allocated by task 12438: [ 2064.344057] kasan_save_stack+0x1c/0x40 [ 2064.345079] __kasan_kmalloc+0x84/0xa0 [ 2064.345933] kmem_cache_alloc_trace+0x13b/0x220 [ 2064.346953] dlm_posix_unlock+0xec/0x720 [dlm] [ 2064.348811] do_lock_file_wait.part.32+0xca/0x1d0 [ 2064.351070] fcntl_setlk+0x281/0xbc0 [ 2064.352879] do_fcntl+0x5e4/0xfe0 [ 2064.354657] __x64_sys_fcntl+0x11f/0x170 [ 2064.356550] do_syscall_64+0x3a/0x80 [ 2064.358259] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 2064.360745] [ 2064.361511] Last potentially related work creation: [ 2064.363957] kasan_save_stack+0x1c/0x40 [ 2064.365811] __kasan_record_aux_stack+0xaf/0xc0 [ 2064.368100] call_rcu+0x11b/0xf70 [ 2064.369785] dlm_process_incoming_buffer+0x47d/0xfd0 [dlm] [ 2064.372404] receive_from_sock+0x290/0x770 [dlm] [ 2064.374607] process_recv_sockets+0x32/0x40 [dlm] [ 2064.377290] process_one_work+0x9a8/0x16e0 [ 2064.379357] worker_thread+0x87/0xbf0 [ 2064.381188] kthread+0x3ac/0x490 [ 2064.383460] ret_from_fork+0x22/0x30 [ 2064.385588] [ 2064.386518] Second to last potentially related work creation: [ 2064.389219] kasan_save_stack+0x1c/0x40 [ 2064.391043] __kasan_record_aux_stack+0xaf/0xc0 [ 2064.393303] call_rcu+0x11b/0xf70 [ 2064.394885] dlm_process_incoming_buffer+0x47d/0xfd0 [dlm] [ 2064.397694] receive_from_sock+0x290/0x770 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
Version: 586759f03e2e9031ac5589912a51a909ed53c30a
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{
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            },
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              "version": "5.19",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: fix plock invalid read\n\nThis patch fixes an invalid read showed by KASAN. A unlock will allocate a\n\"struct plock_op\" and a followed send_op() will append it to a global\nsend_list data structure. In some cases a followed dev_read() moves it\nto recv_list and dev_write() will cast it to \"struct plock_xop\" and access\nfields which are only available in those structures. At this point an\ninvalid read happens by accessing those fields.\n\nTo fix this issue the \"callback\" field is moved to \"struct plock_op\" to\nindicate that a cast to \"plock_xop\" is allowed and does the additional\n\"plock_xop\" handling if set.\n\nExample of the KASAN output which showed the invalid read:\n\n[ 2064.296453] ==================================================================\n[ 2064.304852] BUG: KASAN: slab-out-of-bounds in dev_write+0x52b/0x5a0 [dlm]\n[ 2064.306491] Read of size 8 at addr ffff88800ef227d8 by task dlm_controld/7484\n[ 2064.308168]\n[ 2064.308575] CPU: 0 PID: 7484 Comm: dlm_controld Kdump: loaded Not tainted 5.14.0+ #9\n[ 2064.310292] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\n[ 2064.311618] Call Trace:\n[ 2064.312218]  dump_stack_lvl+0x56/0x7b\n[ 2064.313150]  print_address_description.constprop.8+0x21/0x150\n[ 2064.314578]  ? dev_write+0x52b/0x5a0 [dlm]\n[ 2064.315610]  ? dev_write+0x52b/0x5a0 [dlm]\n[ 2064.316595]  kasan_report.cold.14+0x7f/0x11b\n[ 2064.317674]  ? dev_write+0x52b/0x5a0 [dlm]\n[ 2064.318687]  dev_write+0x52b/0x5a0 [dlm]\n[ 2064.319629]  ? dev_read+0x4a0/0x4a0 [dlm]\n[ 2064.320713]  ? bpf_lsm_kernfs_init_security+0x10/0x10\n[ 2064.321926]  vfs_write+0x17e/0x930\n[ 2064.322769]  ? __fget_light+0x1aa/0x220\n[ 2064.323753]  ksys_write+0xf1/0x1c0\n[ 2064.324548]  ? __ia32_sys_read+0xb0/0xb0\n[ 2064.325464]  do_syscall_64+0x3a/0x80\n[ 2064.326387]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[ 2064.327606] RIP: 0033:0x7f807e4ba96f\n[ 2064.328470] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 39 87 f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 87 f8 ff 48\n[ 2064.332902] RSP: 002b:00007ffd50cfe6e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001\n[ 2064.334658] RAX: ffffffffffffffda RBX: 000055cc3886eb30 RCX: 00007f807e4ba96f\n[ 2064.336275] RDX: 0000000000000040 RSI: 00007ffd50cfe7e0 RDI: 0000000000000010\n[ 2064.337980] RBP: 00007ffd50cfe7e0 R08: 0000000000000000 R09: 0000000000000001\n[ 2064.339560] R10: 000055cc3886eb30 R11: 0000000000000293 R12: 000055cc3886eb80\n[ 2064.341237] R13: 000055cc3886eb00 R14: 000055cc3886f590 R15: 0000000000000001\n[ 2064.342857]\n[ 2064.343226] Allocated by task 12438:\n[ 2064.344057]  kasan_save_stack+0x1c/0x40\n[ 2064.345079]  __kasan_kmalloc+0x84/0xa0\n[ 2064.345933]  kmem_cache_alloc_trace+0x13b/0x220\n[ 2064.346953]  dlm_posix_unlock+0xec/0x720 [dlm]\n[ 2064.348811]  do_lock_file_wait.part.32+0xca/0x1d0\n[ 2064.351070]  fcntl_setlk+0x281/0xbc0\n[ 2064.352879]  do_fcntl+0x5e4/0xfe0\n[ 2064.354657]  __x64_sys_fcntl+0x11f/0x170\n[ 2064.356550]  do_syscall_64+0x3a/0x80\n[ 2064.358259]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[ 2064.360745]\n[ 2064.361511] Last potentially related work creation:\n[ 2064.363957]  kasan_save_stack+0x1c/0x40\n[ 2064.365811]  __kasan_record_aux_stack+0xaf/0xc0\n[ 2064.368100]  call_rcu+0x11b/0xf70\n[ 2064.369785]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]\n[ 2064.372404]  receive_from_sock+0x290/0x770 [dlm]\n[ 2064.374607]  process_recv_sockets+0x32/0x40 [dlm]\n[ 2064.377290]  process_one_work+0x9a8/0x16e0\n[ 2064.379357]  worker_thread+0x87/0xbf0\n[ 2064.381188]  kthread+0x3ac/0x490\n[ 2064.383460]  ret_from_fork+0x22/0x30\n[ 2064.385588]\n[ 2064.386518] Second to last potentially related work creation:\n[ 2064.389219]  kasan_save_stack+0x1c/0x40\n[ 2064.391043]  __kasan_record_aux_stack+0xaf/0xc0\n[ 2064.393303]  call_rcu+0x11b/0xf70\n[ 2064.394885]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]\n[ 2064.397694]  receive_from_sock+0x290/0x770 \n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - GFS2 and OCFS2 use dlm_posix_unlock for posix locks and are NFS-exportable; remote NLM/NFSv4 unlock reaches vfs_lock_file \u2192 gfs2_lock/ocfs2 plock \u2192 dlm_posix_unlock, and the plock_xop path exists specifically for NFS lock support.\nAC:L - Any unlock/get that queues a small plock_op and gets a userspace reply reliably hits the out-of-bounds callback read; shaping adjacent kmalloc-96 residue so the stale callback is non-NULL is attacker-influenced heap grooming, not an uncontrollable condition.\nPR:N - A remote NFS client can issue lock/unlock on a writable exported GFS2/OCFS2 share without local shell access or capabilities; on permissive/anonymous exports no prior authenticated privileges are required.\nUI:N - No victim interaction is required once the cluster filesystem is mounted and exported; the attacker triggers the path directly with lock/unlock requests.\nS:U - Impact stays inside the host kernel security authority (memory safety / privilege escalation on that node), with no VM escape or other cross-boundary scope change.\nC:H - Unlock allocates sizeof(plock_op) (~88B) but dev_write treats it as plock_xop and reads a stale callback past the allocation; a non-NULL value enters dlm_plock_callback and further out-of-bounds pointer reads, which is defensibly a high confidentiality memory-corruption primitive.\nI:H - When the out-of-bounds callback is non-NULL, dlm_plock_callback invokes that function pointer on attacker-influenced adjacent memory, enabling control-flow hijacking / integrity compromise.\nA:H - Calling through a garbage callback or further out-of-bounds accesses can oops/panic the kernel; even the KASAN report is an invalid slab read during normal unlock completion."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:03.171Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2c55155cc365861044d9e6e80e342693e8805e33"
        },
        {
          "url": "https://git.kernel.org/stable/c/72f2f68970f9bdc252d59e119b385a6441b0b155"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a1765adf9855cf0f6d3f7e0eb4b78ca66f70dee"
        },
        {
          "url": "https://git.kernel.org/stable/c/49cd9eb7b9a7b88124b31e31f8e539acaf1b3a6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/899bc4429174861122f0c236588700a4710c1fec"
        },
        {
          "url": "https://git.kernel.org/stable/c/acdad5bc9827922ec2f2e84fd198718aa8e8ab92"
        },
        {
          "url": "https://git.kernel.org/stable/c/56aa8d1fbd02357f3bf81bdfba1cde87ce8402fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/e421872fa17542cf33747071fb141b0130ce9ef7"
        },
        {
          "url": "https://git.kernel.org/stable/c/42252d0d2aa9b94d168241710a761588b3959019"
        }
      ],
      "title": "dlm: fix plock invalid read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49407",
    "datePublished": "2025-02-26T02:12:31.562Z",
    "dateReserved": "2025-02-26T02:08:31.566Z",
    "dateUpdated": "2026-08-05T08:55:03.171Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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