CVE-2022-48822

High

In the Linux kernel, the following vulnerability has been resolved: usb: f_fs: Fix use-after-free for epfile Consider a case where ffs_func_eps_disable is called from ffs_func_disable as part of composition switch and at the same time ffs_epfile_release get called from userspace. ffs_epfile_release will free up the read buffer and call ffs_data_closed which in turn destroys ffs->epfiles and mark it as NULL. While this was happening the driver has already initialized the local epfile in ffs_func_eps_disable which is now freed and waiting to acquire the spinlock. Once spinlock is acquired the driver proceeds with the stale value of epfile and tries to free the already freed read buffer causing use-after-free. Following is the illustration of the race: CPU1 CPU2 ffs_func_eps_disable epfiles (local copy) ffs_epfile_release ffs_data_closed if (last file closed) ffs_data_reset ffs_data_clear ffs_epfiles_destroy spin_lock dereference epfiles Fix this races by taking epfiles local copy & assigning it under spinlock and if epfiles(local) is null then update it in ffs->epfiles then finally destroy it. Extending the scope further from the race, protecting the ep related structures, and concurrent accesses.

Package Linux Kernel
Published 2024-07-16
Last modified 2024-11-21
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-416

CVE-2022-48822 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.8.10, 4.9 and later are affected. Fixed in 4.14.267, 4.19.230, 5.4.180, 5.10.101, 5.15.24, 5.16.10, 5.17 and their respective stable series.

Affected from
≥ 4.8.10 ≥ 4.9
Fixed in
✓ 4.14.267 4.14.x ✓ 4.19.230 4.19.x ✓ 5.4.180 5.4.x ✓ 5.10.101 5.10.x ✓ 5.15.24 5.15.x ✓ 5.16.10 5.16.x ✓ 5.17

References

7 total
Showing 5 of 7 references View all on NVD

Frequently asked questions

  • What is CVE-2022-48822?

    CVE-2022-48822 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 4.8.10 onward and has been patched in 4.14.267, 4.19.230, 5.4.180 and others. CVE-2022-48822 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2022-48822?

    CVE-2022-48822 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2022-48822?

    Yes. CVE-2022-48822 has been patched. Fixed versions include 4.14.267, 4.19.230, 5.4.180 and others. If you are running Linux kernel 4.8.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2022-48822 actively exploited?

    No. CVE-2022-48822 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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