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.
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.
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.