What is CVE-2022-48751?

CVE-2022-48751 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 4.19.299 onward and patched in 5.15.19, 5.16.5 and 5.17. CVE-2022-48751 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-48751?

CVE-2022-48751 has a CVSS score of 4.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2022-48751?

Yes, CVE-2022-48751 has been patched. Fixed versions include 5.15.19, 5.16.5 and 5.17. If you are running Linux kernel 4.19.299 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-48751 actively exploited?

CVE-2022-48751 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2022-48751

Medium

In the Linux kernel, the following vulnerability has been resolved: net/smc: Transitional solution for clcsock race issue We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released. 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 PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: <TASK> __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e </TASK> This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access. In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.

Package Linux Kernel

Published 2024-06-20

Last modified 2025-01-06

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

4.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2022-48751 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.19.299, 5.1 and later are affected. Fixed in 5.15.19, 5.16.5, 5.17 and their respective stable series.

Affected from

≥ 4.19.299 ≥ 5.1

Fixed in

✓ 5.15.19 5.15.x ✓ 5.16.5 5.16.x ✓ 5.17

References

3 total

Kernel Git
https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34

Patch
Kernel Git
https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f

Patch
Kernel Git
https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760

Patch

Details

CVE ID CVE-2022-48751

Severity Medium

CVSS score 4.7 / 10

CVSS version 3.1

Published 2024-06-20

Modified 2025-01-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-48751?

CVE-2022-48751 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 4.19.299 onward and has been patched in 5.15.19, 5.16.5 and 5.17. CVE-2022-48751 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-48751?

CVE-2022-48751 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2022-48751?

Yes. CVE-2022-48751 has been patched. Fixed versions include 5.15.19, 5.16.5 and 5.17. If you are running Linux kernel 4.19.299 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-48751 actively exploited?

No. CVE-2022-48751 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.