Bug 2324852 (CVE-2024-50227) - CVE-2024-50227 kernel: thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan()
Summary: CVE-2024-50227 kernel: thunderbolt: Fix KASAN reported stack out-of-bounds re...
Keywords:
Status: NEW
Alias: CVE-2024-50227
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2325071
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-11-09 11:01 UTC by OSIDB Bzimport
Modified: 2024-11-21 15:35 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


Attachments (Terms of Use)

Description OSIDB Bzimport 2024-11-09 11:01:14 UTC
In the Linux kernel, the following vulnerability has been resolved:

thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan()

KASAN reported following issue:

 BUG: KASAN: stack-out-of-bounds in tb_retimer_scan+0xffe/0x1550 [thunderbolt]
 Read of size 4 at addr ffff88810111fc1c by task kworker/u56:0/11
 CPU: 0 UID: 0 PID: 11 Comm: kworker/u56:0 Tainted: G     U             6.11.0+ #1387
 Tainted: [U]=USER
 Workqueue: thunderbolt0 tb_handle_hotplug [thunderbolt]
 Call Trace:
  <TASK>
  dump_stack_lvl+0x6c/0x90
  print_report+0xd1/0x630
  kasan_report+0xdb/0x110
  __asan_report_load4_noabort+0x14/0x20
  tb_retimer_scan+0xffe/0x1550 [thunderbolt]
  tb_scan_port+0xa6f/0x2060 [thunderbolt]
  tb_handle_hotplug+0x17b1/0x3080 [thunderbolt]
  process_one_work+0x626/0x1100
  worker_thread+0x6c8/0xfa0
  kthread+0x2c8/0x3a0
  ret_from_fork+0x3a/0x80
  ret_from_fork_asm+0x1a/0x30

This happens because the loop variable still gets incremented by one so
max becomes 3 instead of 2, and this makes the second loop read past the
the array declared on the stack.

Fix this by assigning to max directly in the loop body.

Comment 1 Avinash Hanwate 2024-11-11 03:59:39 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110928-CVE-2024-50227-1fae@gregkh/T


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