Answer in brief
CVE-2025-39857 records a Unknown severity vulnerability in net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0ef69e788411cba2af017db731a9fc62d255e9ac <0cdf1fd8fc59d44a48c694324611136910301ef9 || >=0ef69e788411cba2af017db731a9fc62d255e9ac <f18d9b3abf9c6587372cc702f963a7592277ed56 || >=0ef69e788411cba2af017db731a9fc62d255e9ac <eb929910bd4b4165920fa06a87b22cc6cae92e0e || >=0ef69e788411cba2af017db731a9fc62d255e9ac <34f17cbe027050b8d5316ea1b6f9bd7c378e92de || >=0ef69e788411cba2af017db731a9fc62d255e9ac <ba1e9421cf1a8369d25c3832439702a015d6b5f9 | 0cdf1fd8fc59d44a48c694324611136910301ef9, f18d9b3abf9c6587372cc702f963a7592277ed56, eb929910bd4b4165920fa06a87b22cc6cae92e0e, 34f17cbe027050b8d5316ea1b6f9bd7c378e92de, ba1e9421cf1a8369d25c3832439702a015d6b5f9 |
| Linux/Linuxgeneric | 6.0 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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> If the software RoCE device is used, ibdev->dma_device is a null pointer. As a result, the problem occurs. Null pointer detection is added to prevent problems.
Quoted source text, attributed separately from HOL analysis.