CVE-2024-44951

High

In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.

Package Linux Kernel
Published 2024-09-04
Last modified 2024-10-09
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-667

CVE-2024-44951 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.1.76, 6.6.15, 6.7.3, 6.8 and later are affected. Fixed in 6.10.5, 6.11 and their respective stable series.

Affected from
≥ 6.1.76 ≥ 6.6.15 ≥ 6.7.3 ≥ 6.8
Fixed in
✓ 6.10.5 6.10.x ✓ 6.11

References

The following references provide additional information about CVE-2024-44951 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Frequently asked questions

  • What is CVE-2024-44951?

    CVE-2024-44951 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 6.1.76 onward and has been patched in 6.10.5 and 6.11. CVE-2024-44951 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2024-44951?

    CVE-2024-44951 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-2024-44951?

    Yes — CVE-2024-44951 has been patched. Fixed versions include 6.10.5 and 6.11. If you are running Linux kernel 6.1.76 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2024-44951 actively exploited?

    No — CVE-2024-44951 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

  • What is Improper Locking (CWE-667)?

    The product does not properly acquire or release a lock, which can lead to unexpected behaviour. View CWE-667 on MITRE CWE →

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