CVE-2022-49395

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

State: Published
Severity: 7.1 High
Published: Feb 26, 2025
Updated: May 11, 2026
Reserved: Feb 26, 2025

Description

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' ==================================================================

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	CISA-ADP

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	858259cf7d1c443c836a2022b78cb281f0a9b95e to before 668ca34a428d6ffc0f99a1a6a9b661a288d4183bAffected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before ef1dc929a1e5fa1b2d842256db9fb8710d3be910Affected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 3549ab4b962cf619e8c55484a0d870a34b3f845fAffected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 9caad70819aef3431abaf73ba5163b55b161aba0Affected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before cf0dabc37446c5ee538ae7b4c467ab0e53fa5463Affected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 10995a382271254bd276627ec74136da4a23c4a6Affected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 24ca648bf5f72ed8878cf09b5d4431935779681eAffected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 91e5ba2af2d729d5126aefd5aa3eadc69b8426e5Affected 858259cf7d1c443c836a2022b78cb281f0a9b95e to before 2a4a62a14be1947fa945c5c11ebf67326381a568Affected
LinuxLinux	2.6.15Affected before 2.6.15Not affected 4.9.318 through 4.9.Not affected 4.14.283 through 4.14.Not affected 4.19.247 through 4.19.Not affected 5.4.198 through 5.4.Not affected 5.10.121 through 5.10.Not affected 5.15.46 through 5.15.Not affected 5.17.14 through 5.17.Not affected 5.18.3 through 5.18.Not affected 5.19 and laterNot affected

Product

Versions

LinuxLinux

858259cf7d1c443c836a2022b78cb281f0a9b95e to before 668ca34a428d6ffc0f99a1a6a9b661a288d4183bAffected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before ef1dc929a1e5fa1b2d842256db9fb8710d3be910Affected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 3549ab4b962cf619e8c55484a0d870a34b3f845fAffected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 9caad70819aef3431abaf73ba5163b55b161aba0Affected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before cf0dabc37446c5ee538ae7b4c467ab0e53fa5463Affected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 10995a382271254bd276627ec74136da4a23c4a6Affected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 24ca648bf5f72ed8878cf09b5d4431935779681eAffected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 91e5ba2af2d729d5126aefd5aa3eadc69b8426e5Affected
858259cf7d1c443c836a2022b78cb281f0a9b95e to before 2a4a62a14be1947fa945c5c11ebf67326381a568Affected

LinuxLinux

2.6.15Affected
before 2.6.15Not affected
4.9.318 through 4.9.*Not affected
4.14.283 through 4.14.*Not affected
4.19.247 through 4.19.*Not affected
5.4.198 through 5.4.*Not affected
5.10.121 through 5.10.*Not affected
5.15.46 through 5.15.*Not affected
5.17.14 through 5.17.*Not affected
5.18.3 through 5.18.*Not affected
5.19 and laterNot affected

References

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