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CVE-2025-39857— net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smc_ib_is_sg_need_sync函数中存在空指针取消引用。

CVSS 7.5 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0ef69e788411cba2af017db731a9fc62d255e9ac< 0cdf1fd8fc59d44a48c694324611136910301ef9 affected
0ef69e788411cba2af017db731a9fc62d255e9ac< f18d9b3abf9c6587372cc702f963a7592277ed56 affected
0ef69e788411cba2af017db731a9fc62d255e9ac< eb929910bd4b4165920fa06a87b22cc6cae92e0e affected
0ef69e788411cba2af017db731a9fc62d255e9ac< 34f17cbe027050b8d5316ea1b6f9bd7c378e92de affected
0ef69e788411cba2af017db731a9fc62d255e9ac< ba1e9421cf1a8369d25c3832439702a015d6b5f9 affected
6.0 affected
< 6.0 unaffected
6.1.151≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-39857

Vulnerability Information
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Vulnerability Title
net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()
Source: CVE Program / CVE List V5
Vulnerability 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> 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smc_ib_is_sg_need_sync函数中存在空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0ef69e788411cba2af017db731a9fc62d255e9ac ~ 0cdf1fd8fc59d44a48c694324611136910301ef9 -
Linux Linux 6.0 -

II. Public POCs for CVE-2025-39857

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III. Intelligence Information for CVE-2025-39857

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39841 9.8 CRITICAL scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39848 8.8 HIGH ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39864 8.8 HIGH wifi: cfg80211: fix use-after-free in cmp_bss()
CVE-2025-39849 8.8 HIGH wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39862 8.8 HIGH wifi: mt76: mt7915: fix list corruption after hardware restart
CVE-2025-39839 8.8 HIGH batman-adv: fix OOB read/write in network-coding decode
CVE-2025-39860 8.0 HIGH Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()
CVE-2025-39837 7.8 HIGH platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39866 7.8 HIGH fs: writeback: fix use-after-free in __mark_inode_dirty()
CVE-2025-39854 7.8 HIGH ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39863 7.8 HIGH wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
CVE-2025-39851 7.5 HIGH vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39840 7.1 HIGH audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39842 ocfs2: prevent release journal inode after journal shutdown
CVE-2025-39844 mm: move page table sync declarations to linux/pgtable.h
CVE-2025-39838 cifs: prevent NULL pointer dereference in UTF16 conversion
CVE-2025-39843 mm: slub: avoid wake up kswapd in set_track_prepare
CVE-2025-39852 net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6
CVE-2025-39845 x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
CVE-2025-39846 pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39857

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