CVE-2022-49685: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: iio: trigger: sysfs: fix use-after-free on remove Ensure that the irq_work has completed before the trigger is freed. ================================================================== BUG: KASAN: use-after-free in irq_work_run_list Read of size 8 at addr 0000000064702248 by task python3/25 Call Trace: irq_work_run_list irq_work_tick update_process_times tick_sched_handle tick_sched_timer __hrtimer_run_queues hrtimer_interrupt Allocated by task 25: kmem_cache_alloc_trace iio_sysfs_trig_add dev_attr_store sysfs_kf_write kernfs_fop_write_iter new_sync_write vfs_write ksys_write sys_write Freed by task 25: kfree iio_sysfs_trig_remove dev_attr_store sysfs_kf_write kernfs_fop_write_iter new_sync_write vfs_write ksys_write sys_write ==================================================================

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.7 — 4.9.321
linux	linux_kernel	4.10 — 4.14.286
linux	linux_kernel	4.15 — 4.19.250
linux	linux_kernel	4.20 — 5.4.202
linux	linux_kernel	5.5 — 5.10.127
linux	linux_kernel	5.11 — 5.15.51
linux	linux_kernel	5.16 — 5.18.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/31ff3309b47d98313c61b8301bf595820cc3cc33 https://git.kernel.org/stable/c/4687c3f955240ca2a576bdc3f742d4d915b6272d https://git.kernel.org/stable/c/4ef1e521be610b720daeb7cf899fedc7db0274c4 https://git.kernel.org/stable/c/5e39397d60dacc7f5d81d442c1c958eaaaf31128 https://git.kernel.org/stable/c/78601726d4a59a291acc5a52da1d3a0a6831e4e8 https://git.kernel.org/stable/c/b07a30a774b3c3e584a68dc91779c68ea2da4813 https://git.kernel.org/stable/c/d6111e7bdb8ec27eb43d01c4cd4ff1620a75f7f2 https://git.kernel.org/stable/c/fd5d8fb298a2866c337da635c79d63c3afabcaf7

Frequently Asked Questions

What is CVE-2022-49685? +

In the Linux kernel, the following vulnerability has been resolved: iio: trigger: sysfs: fix use-after-free on remove Ensure that the irq_work has completed before the trigger is freed. ================================================================== BUG: KASAN: use-after-free in irq_work_run_list Read of size 8 at addr 0000000064702248 by task python3/25 Call Trace: irq_work_run_list irq_work_tick update_process_times tick_sched_handle tick_sched_timer __hrtimer_run_queues hrtimer_interrupt Allocated by task 25: kmem_cache_alloc_trace iio_sysfs_trig_add dev_attr_store sysfs_kf_write kernfs_fop_write_iter new_sync_write vfs_write ksys_write sys_write Freed by task 25: kfree iio_sysfs_trig_remove dev_attr_store sysfs_kf_write kernfs_fop_write_iter new_sync_write vfs_write ksys_write sys_write ================================================================== It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49685? +

CVE-2022-49685 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49685? +

CVE-2022-49685 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49685? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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