{"id":"CVE-2025-71132","revision":"356b690fc5934a1abe9efd814bb1fcde","records":[{"revision":"356b690fc5934a1abe9efd814bb1fcde","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-71132","aliases":[],"title":"smc91x: fix broken irq-context in PREEMPT_RT","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmc91x: fix broken irq-context in PREEMPT_RT\n\nWhen smc91x.c is built with PREEMPT_RT, the following splat occurs\nin FVP_RevC:\n\n[   13.055000] smc91x LNRO0003:00 eth0: link up, 10Mbps, half-duplex, lpa 0x0000\n[   13.062137] BUG: workqueue leaked atomic, lock or RCU: kworker/2:1[106]\n[   13.062137]      preempt=0x00000000 lock=0->0 RCU=0->1 workfn=mld_ifc_work\n[   13.062266] C\n** replaying previous printk message **\n[   13.062266] CPU: 2 UID: 0 PID: 106 Comm: kworker/2:1 Not tainted 6.18.0-dirty #179 PREEMPT_{RT,(full)}\n[   13.062353] Hardware name:  , BIOS\n[   13.062382] Workqueue: mld mld_ifc_work\n[   13.062469] Call trace:\n[   13.062494]  show_stack+0x24/0x40 (C)\n[   13.062602]  __dump_stack+0x28/0x48\n[   13.062710]  dump_stack_lvl+0x7c/0xb0\n[   13.062818]  dump_stack+0x18/0x34\n[   13.062926]  process_scheduled_works+0x294/0x450\n[   13.063043]  worker_thread+0x260/0x3d8\n[   13.063124]  kthread+0x1c4/0x228\n[   13.063235]  ret_from_fork+0x10/0x20\n\nThis happens because smc_special_trylock() disables IRQs even on PREEMPT_RT,\nbut smc_special_unlock() does not restore IRQs on PREEMPT_RT.\nThe reason is that smc_special_unlock() calls spin_unlock_irqrestore(),\nand rcu_read_unlock_bh() in __dev_queue_xmit() cannot invoke\nrcu_read_unlock() through __local_bh_enable_ip() when current->softirq_disable_cnt becomes zero.\n\nTo address this issue, replace smc_special_trylock() with spin_trylock_irqsave().","state":0,"publishedAt":"2026-01-14T15:07:47.86+00:00","modifiedAt":"2026-10-19T18:15:15.774+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/smsc/smc91x.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"1c4cb705e733250d13243f6a69b8b5a92e39b9f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"9d222141b00156509d67d80c771fbefa92c43ace\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"ef277ae121b3249c99994652210a326b52d527b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"36561b86cb2501647662cfaf91286dd6973804a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"342a93247e0837101f27bbcca26f402902df98dc\",\n                            \"lessThan\": \"6402078bd9d1ed46e79465e1faaa42e3458f8a33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/smsc/smc91x.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.198\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.160\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.120\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.64\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.4\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/1c4cb705e733250d13243f6a69b8b5a92e39b9f6","https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace","https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0","https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6","https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3","https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71132","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-71132","identifiers":["CVE-2025-71132"]},"retained":false,"historicalAffected":[]}],"coverage":[]}