CVE-2024-27060

published 2024-05-01

CVE-2024-27060: In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Fix NULL pointer dereference in tb_port_update_credits() Olliver reported that…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

thunderbolt: Fix NULL pointer dereference in tb_port_update_credits()

Olliver reported that his system crashes when plugging in Thunderbolt 1
device:

BUG: kernel NULL pointer dereference, address: 0000000000000020
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
RIP: 0010:tb_port_do_update_credits+0x1b/0x130 [thunderbolt]
Call Trace:

? __die+0x23/0x70
? page_fault_oops+0x171/0x4e0
? exc_page_fault+0x7f/0x180
? asm_exc_page_fault+0x26/0x30
? tb_port_do_update_credits+0x1b/0x130
? tb_switch_update_link_attributes+0x83/0xd0
tb_switch_add+0x7a2/0xfe0
tb_scan_port+0x236/0x6f0
tb_handle_hotplug+0x6db/0x900
process_one_work+0x171/0x340
worker_thread+0x27b/0x3a0
? __pfx_worker_thread+0x10/0x10
kthread+0xe5/0x120
? __pfx_kthread+0x10/0x10
ret_from_fork+0x31/0x50
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1b/0x30

This is due the fact that some Thunderbolt 1 devices only have one lane
adapter. Fix this by checking for the lane 1 before we read its credits.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.7.12-1 (forky)	linux 6.7.12-1 (forky)
linux	linux	—	—
linux	linux	>= 81af2952e60603d12415e1a6fd200f8073a2ad8b < ce64ba1f6ec3439e4b4d880b4db99673f4507228	ce64ba1f6ec3439e4b4d880b4db99673f4507228
linux	linux	>= 81af2952e60603d12415e1a6fd200f8073a2ad8b < d3d17e23d1a0d1f959b4fa55b35f1802d9c584fa	d3d17e23d1a0d1f959b4fa55b35f1802d9c584fa
linux	linux	>= 9b6933e9bddc04655a894c74cd5c62202a5e3d89 < 440fba897c5ae32d7df1f1d609dbb19e2bba7fbb	440fba897c5ae32d7df1f1d609dbb19e2bba7fbb
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.7.12-1	6.7.12-1
linux	linux_kernel	>= 0 < 6.7.12-1	6.7.12-1
linux	linux_kernel	>= 6.7 < 6.7.12	6.7.12

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 LOW

vendor_redhat 5.5 MEDIUM

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