CVE-2022-49395

Summary

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'

Affected Software

VendorProductVersion RangeStatus
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 668ca34a428d6ffc0f99a1a6a9b661a288d4183baffected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < ef1dc929a1e5fa1b2d842256db9fb8710d3be910affected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 3549ab4b962cf619e8c55484a0d870a34b3f845faffected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 9caad70819aef3431abaf73ba5163b55b161aba0affected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < cf0dabc37446c5ee538ae7b4c467ab0e53fa5463affected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 10995a382271254bd276627ec74136da4a23c4a6affected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 24ca648bf5f72ed8878cf09b5d4431935779681eaffected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 91e5ba2af2d729d5126aefd5aa3eadc69b8426e5affected
LinuxLinux858259cf7d1c443c836a2022b78cb281f0a9b95e < 2a4a62a14be1947fa945c5c11ebf67326381a568affected
LinuxLinux2.6.15affected
LinuxLinux0 < 2.6.15unaffected
LinuxLinux4.9.318 <= 4.9.*unaffected
LinuxLinux4.14.283 <= 4.14.*unaffected
LinuxLinux4.19.247 <= 4.19.*unaffected
LinuxLinux5.4.198 <= 5.4.*unaffected
LinuxLinux5.10.121 <= 5.10.*unaffected
LinuxLinux5.15.46 <= 5.15.*unaffected
LinuxLinux5.17.14 <= 5.17.*unaffected
LinuxLinux5.18.3 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References