🛡️ CVE-2022-49395 — kernel

🟠 CVSS 7.1 — High ✅ No Known Exploit NVD
7.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

um: Fix out-of-bounds read in LDT setup

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'

==================================================================

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.

Affected software

CVE-2022-49395 is recorded against 2 packages.

  • kernel (from 5.18.0 up to 5.18.3)
  • linux-kernel (from 5.18 up to 5.18.3)

Timeline and source

Published on 26 February 2025 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2022-49395 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-02-26
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 5.18.0 5.18.3
linux-kernel 5.18 5.18.3

References

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