What is CVE-2021-47240?

CVE-2021-47240 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 4.15 onward and patched in 4.19.196, 5.4.128, 5.10.46 and others. CVE-2021-47240 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47240?

CVE-2021-47240 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2021-47240?

Yes, CVE-2021-47240 has been patched. Fixed versions include 4.19.196, 5.4.128, 5.10.46 and others. If you are running Linux kernel 4.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47240 actively exploited?

CVE-2021-47240 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2021-47240

High

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and skb_put_data(skb, data + hdrlen, size); will read out of bound from data, which is hdrlen allocated block.

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2021-47240 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.15 and later are affected. Fixed in 4.19.196, 5.4.128, 5.10.46, 5.12.13, 5.13 and their respective stable series.

Affected from

≥ 4.15

Fixed in

✓ 4.19.196 4.19.x ✓ 5.4.128 5.4.x ✓ 5.10.46 5.10.x ✓ 5.12.13 5.12.x ✓ 5.13

References

5 total

Kernel Git
https://git.kernel.org/stable/c/19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe

Patch
Kernel Git
https://git.kernel.org/stable/c/26b8d10703a9be45d6097946b2b4011f7dd2c56f

Patch
Kernel Git
https://git.kernel.org/stable/c/960b08dd36de1e341e3eb43d1c547513e338f4f8

Patch
Kernel Git
https://git.kernel.org/stable/c/ad9d24c9429e2159d1e279dc3a83191ccb4daf1d

Patch
Kernel Git
https://git.kernel.org/stable/c/f8111c0d7ed42ede41a3d0d393b104de0730a8a6

Patch

Details

CVE ID CVE-2021-47240

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47240?

CVE-2021-47240 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 4.15 onward and has been patched in 4.19.196, 5.4.128, 5.10.46 and others. CVE-2021-47240 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47240?

CVE-2021-47240 has a CVSS score of 7.1 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:N/A:H.
Is there a patch available for CVE-2021-47240?

Yes. CVE-2021-47240 has been patched. Fixed versions include 4.19.196, 5.4.128, 5.10.46 and others. If you are running Linux kernel 4.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47240 actively exploited?

No. CVE-2021-47240 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.