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NVD / CVE Program· CNA Linux

CVE-2022-49395: um: Fix out-of-bounds read in LDT setup

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: 0.28% (FIRST EPSS).
  • 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.
  • Fixed version: Linux Linux 10995a382271254bd276627ec74136da4a23c4a6, 24ca648bf5f72ed8878cf09b5d4431935779681e, 2a4a62a14be1947fa945c5c11ebf67326381a568.

Low priority for now. Upgrade to Linux Linux 10995a382271254bd276627ec74136da4a23c4a6, 24ca648bf5f72ed8878cf09b5d4431935779681e, 2a4a62a14be1947fa945c5c11ebf67326381a568 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: um: Fix out-of-bounds read in LDT setup syscall_stub_data() expects the data_count parameter to be the number of longs, not bytes. ================================================================== BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0 Read of size 128 at addr 000000006411f6f0 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18 Call Trace: show_stack.cold+0x166/0x2a7 __dump_stack+0x3a/0x43 dump_stack_lvl+0x1f/0x27 print_report.cold+0xdb/0xf81 kasan_report+0x119/0x1f0 kasan_check_range+0x3a3/0x440 memcpy+0x52/0x140 syscall_stub_data+0x70/0xe0 write_ldt_entry+0xac/0x190 init_new_ldt+0x515/0x960 init_new_context+0x2c4/0x4d0 mm_init.constprop.0+0x5ed/0x760 mm_alloc+0x118/0x170 0x60033f48 do_one_initcall+0x1d7/0x860 0x60003e7b kernel_init+0x6e/0x3d4 new_thread_handler+0x1e7/0x2c0 The buggy address belongs to stack of task swapper/1 and is located at offset 64 in frame: init_new_ldt+0x0/0x960 This frame has 2 objects: [32, 40) 'addr' [64, 80) 'desc' ==================================================================

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 21th 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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

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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 kernel2.6.15 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

    • 2.6.15affected
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 668ca34a428d6ffc0f99a1a6a9b661a288d4183baffected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before ef1dc929a1e5fa1b2d842256db9fb8710d3be910affected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 3549ab4b962cf619e8c55484a0d870a34b3f845faffected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 9caad70819aef3431abaf73ba5163b55b161aba0affected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before cf0dabc37446c5ee538ae7b4c467ab0e53fa5463affected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 10995a382271254bd276627ec74136da4a23c4a6affected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 24ca648bf5f72ed8878cf09b5d4431935779681eaffected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 91e5ba2af2d729d5126aefd5aa3eadc69b8426e5affected · git
    • 858259cf7d1c443c836a2022b78cb281f0a9b95e and later · before 2a4a62a14be1947fa945c5c11ebf67326381a568affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.56.1.el8_104.18.0-553.56.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.56.1.rt7.397.el8_104.18.0-553.56.1.rt7.397.el8_10

+96

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-2022-49393Feb 26, 2025 · misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl
    22Monitor
  • ← EarlierCVE-2022-49394Feb 26, 2025 · blk-iolatency: Fix inflight count imbalances and IO hangs on offline
    22Monitor
  • Later →CVE-2022-49396Feb 26, 2025 · phy: qcom-qmp: fix reset-controller leak on probe errors
    22Monitor

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 Linux10995a382271254bd276627ec74136da4a23c4a6Vendor (CNA)
Linux Linux24ca648bf5f72ed8878cf09b5d4431935779681eVendor (CNA)
Linux Linux2a4a62a14be1947fa945c5c11ebf67326381a568Vendor (CNA)
Linux Linux3549ab4b962cf619e8c55484a0d870a34b3f845fVendor (CNA)
Linux Linux668ca34a428d6ffc0f99a1a6a9b661a288d4183bVendor (CNA)
Linux Linux91e5ba2af2d729d5126aefd5aa3eadc69b8426e5Vendor (CNA)
Linux Linux9caad70819aef3431abaf73ba5163b55b161aba0Vendor (CNA)
Linux Linuxcf0dabc37446c5ee538ae7b4c467ab0e53fa5463Vendor (CNA)
Linux Linuxef1dc929a1e5fa1b2d842256db9fb8710d3be910Vendor (CNA)
almalinux:bpftool4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.56.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux5.18.5-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)

+6

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.

No history yet (it accumulates with the daily EPSS job).

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. 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