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CVE-2025-39857

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() BUG: kernel NULL pointer dereference, address: 0000000000…

Published Sep 19, 2025CWE-476EPSS 0.31%

Overview

CVE-2025-39857 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()

BUG: kernel NULL pointer dereference, address: 00000000000002ec

PGD 0 P4D 0

Oops: Oops: 0000 [#1] SMP PTI

CPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G OE 6.17.0-rc2+ #9 NONE

Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014

Workqueue: smc_hs_wq smc_listen_work [smc]

RIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc]

...

Call Trace:

<TASK>

smcr_buf_map_link+0x211/0x2a0 [smc]

__smc_buf_create+0x522/0x970 [smc]

smc_buf_create+0x3a/0x110 [smc]

smc_find_rdma_v2_device_serv+0x18f/0x240 [smc]

? smc_vlan_by_tcpsk+0x7e/0xe0 [smc]

smc_listen_find_device+0x1dd/0x2b0 [smc]

smc_listen_work+0x30f/0x580 [smc]

process_one_work+0x18c/0x340

worker_thread+0x242/0x360

kthread+0xe7/0x220

ret_from_fork+0x13a/0x160

ret_from_fork_asm+0x1a/0x30

</TASK>

I

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0cdf1fd8fc59d44a48c694324611136910301ef9Refgit.kernel.org/stable/c/34f17cbe027050b8d5316ea1b6f9bd7c378e92deRefgit.kernel.org/stable/c/ba1e9421cf1a8369d25c3832439702a015d6b5f9Refgit.kernel.org/stable/c/eb929910bd4b4165920fa06a87b22cc6cae92e0eRefgit.kernel.org/stable/c/f18d9b3abf9c6587372cc702f963a7592277ed56Reflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-032379.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39857?

CVE-2025-39857 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-39857?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-39857?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39857?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39857 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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