{"id":"CVE-2025-39857","title":"net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()\n\nBUG: kernel NULL pointer dereference, address: 00000000000002ec\nPGD 0 P4D 0\nOops: Oops: 0000 [#1]…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < 0cdf1fd8fc59d44a48c694324611136910301ef9","Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < f18d9b3abf9c6587372cc702f963a7592277ed56","Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < eb929910bd4b4165920fa06a87b22cc6cae92e0e","Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < 34f17cbe027050b8d5316ea1b6f9bd7c378e92de","Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < ba1e9421cf1a8369d25c3832439702a015d6b5f9","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:54:21.002453Z"},"published":"2025-09-19","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:32.358Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39857","references":[{"url":"https://git.kernel.org/stable/c/0cdf1fd8fc59d44a48c694324611136910301ef9"},{"url":"https://git.kernel.org/stable/c/f18d9b3abf9c6587372cc702f963a7592277ed56"},{"url":"https://git.kernel.org/stable/c/eb929910bd4b4165920fa06a87b22cc6cae92e0e"},{"url":"https://git.kernel.org/stable/c/34f17cbe027050b8d5316ea1b6f9bd7c378e92de"},{"url":"https://git.kernel.org/stable/c/ba1e9421cf1a8369d25c3832439702a015d6b5f9"}],"tags":["cve.org"],"epss":0.00314,"epssPercentile":0.24123,"ingestedAt":"2026-10-15T22:48:25.527Z","slug":"CVE-2025-39857","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()\n\nBUG: kernel NULL pointer dereference, address: 00000000000002ec\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP PTI\nCPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G        OE       6.17.0-rc2+ #9 NONE\nTainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nWorkqueue: smc_hs_wq smc_listen_work [smc]\nRIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc]\n...\nCall Trace:\n <TASK>\n smcr_buf_map_link+0x211/0x2a0 [smc]\n __smc_buf_create+0x522/0x970 [smc]\n smc_buf_create+0x3a/0x110 [smc]\n smc_find_rdma_v2_device_serv+0x18f/0x240 [smc]\n ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc]\n smc_listen_find_device+0x1dd/0x2b0 [smc]\n smc_listen_work+0x30f/0x580 [smc]\n process_one_work+0x18c/0x340\n worker_thread+0x242/0x360\n kthread+0xe7/0x220\n ret_from_fork+0x13a/0x160\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n\nIf the software RoCE device is used, ibdev->dma_device is a null pointer.\nAs a result, the problem occurs. Null pointer detection is added to\nprevent problems.\n\n## Affected\n\n- `Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < 0cdf1fd8fc59d44a48c694324611136910301ef9`\n- `Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < f18d9b3abf9c6587372cc702f963a7592277ed56`\n- `Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < eb929910bd4b4165920fa06a87b22cc6cae92e0e`\n- `Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < 34f17cbe027050b8d5316ea1b6f9bd7c378e92de`\n- `Linux >= 0ef69e788411cba2af017db731a9fc62d255e9ac < ba1e9421cf1a8369d25c3832439702a015d6b5f9`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}