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NVD / CVE Program· CNA Linux

CVE-2022-49407: dlm: fix plock invalid read

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.86% (FIRST EPSS); higher than 58.4% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 2c55155cc365861044d9e6e80e342693e8805e33, 42252d0d2aa9b94d168241710a761588b3959019, 49cd9eb7b9a7b88124b31e31f8e539acaf1b3a6d.
  • Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 7.1.

Low priority for now. Upgrade to Linux Linux 2c55155cc365861044d9e6e80e342693e8805e33, 42252d0d2aa9b94d168241710a761588b3959019, 49cd9eb7b9a7b88124b31e31f8e539acaf1b3a6d or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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---

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Oct 15, 2026
EPSS
0.8% · 58th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.1
CNA · Linux
9.8
2.7 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.22 and later · before 4.9.318
  • linux linux kernel4.10 and later · before 4.14.283
  • linux linux kernel4.15 and later · before 4.19.247
  • linux linux kernel4.20 and later · before 5.4.198
  • linux linux kernel5.5 and later · before 5.10.121
  • linux linux kernel5.11 and later · before 5.15.46
  • linux linux kernel5.16 and later · before 5.17.14
  • linux linux kernel5.18 and later · before 5.18.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.22affected
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 2c55155cc365861044d9e6e80e342693e8805e33affected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 72f2f68970f9bdc252d59e119b385a6441b0b155affected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 5a1765adf9855cf0f6d3f7e0eb4b78ca66f70deeaffected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 49cd9eb7b9a7b88124b31e31f8e539acaf1b3a6daffected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 899bc4429174861122f0c236588700a4710c1fecaffected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before acdad5bc9827922ec2f2e84fd198718aa8e8ab92affected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 56aa8d1fbd02357f3bf81bdfba1cde87ce8402fcaffected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before e421872fa17542cf33747071fb141b0130ce9ef7affected · git
    • 586759f03e2e9031ac5589912a51a909ed53c30a and later · before 42252d0d2aa9b94d168241710a761588b3959019affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.5-15.18.5-1
Red Hat:rhel_e4s:9.0::appstreambpftool-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-develbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-develbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-devel-matchedbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-docbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-tools-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-develbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamperfbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamperf-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::appstreampython3-perf-debuginfobefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::baseosbpftoolbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernelbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernel-abi-stablelistsbefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernel-corebefore 0:5.14.0-70.136.1.el9_00:5.14.0-70.136.1.el9_0

+28

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49174Feb 26, 2025 · ext4: fix ext4_mb_mark_bb() with flex_bg with fast_commit
    22Monitor
  • ← EarlierCVE-2022-49178Feb 26, 2025 · memstick/mspro_block: fix handling of read-only devices
    22Monitor
  • Later →CVE-2022-49554Feb 26, 2025 · zsmalloc: fix races between asynchronous zspage free and page migration
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2c55155cc365861044d9e6e80e342693e8805e33Vendor (CNA)
Linux Linux42252d0d2aa9b94d168241710a761588b3959019Vendor (CNA)
Linux Linux49cd9eb7b9a7b88124b31e31f8e539acaf1b3a6dVendor (CNA)
Linux Linux56aa8d1fbd02357f3bf81bdfba1cde87ce8402fcVendor (CNA)
Linux Linux5a1765adf9855cf0f6d3f7e0eb4b78ca66f70deeVendor (CNA)
Linux Linux72f2f68970f9bdc252d59e119b385a6441b0b155Vendor (CNA)
Linux Linux899bc4429174861122f0c236588700a4710c1fecVendor (CNA)
Linux Linuxacdad5bc9827922ec2f2e84fd198718aa8e8ab92Vendor (CNA)
Linux Linuxe421872fa17542cf33747071fb141b0130ce9ef7Vendor (CNA)
debian:linux5.18.5-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-s390x0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-devel0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-devel-matched0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)
red hat:kernel-doc0:5.14.0-70.136.1.el9_0 · Red Hat:rhel_e4s:9.0::appstreamPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records