{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-71132", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:30:19.655Z", "datePublished": "2026-01-14T15:07:47.860Z", "dateUpdated": "2026-08-05T12:12:17.694Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:12:17.694Z" }, "descriptions": [ { "lang": "en", "value": "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()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - Internet-routable ICMP/TCP traffic can force transmission through smc91x, while a pre-authentication network service makes the persistent process-context RCU leak remotely repeatable. An adjacent MLD query also directly schedules report work that reaches the vulnerable path.\nAC:L - On an affected SMP PREEMPT_RT system, every successful transmit-side trylock produces the IRQ-state mismatch without a race or uncontrolled timing requirement. Required packet fields and repeated transmissions are attacker-controlled.\nPR:N - Unauthenticated network traffic reaches the transmit path without target credentials or capabilities. The MLD path likewise has protocol-validity checks but no authentication or privilege check.\nUI:N - Kernel protocol handling and network-service responses occur automatically without victim action.\nS:U - The IRQ and RCU corruption affects the same host kernel security authority and does not cross a VM, IOMMU, or other security boundary.\nC:N - The bug leaks RCU read-side state and disables interrupts but provides no memory disclosure or read primitive.\nI:N - No memory is corrupted and no attacker-controlled write or data-modification primitive is created.\nA:H - Leaked RCU nesting can indefinitely block grace periods and accumulate callbacks, while broken IRQ state can stall critical processing. Repeated triggering can therefore cause RCU stalls or a system-wide hang." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/smsc/smc91x.c" ], "versions": [ { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "1c4cb705e733250d13243f6a69b8b5a92e39b9f6", "status": "affected", "versionType": "git" }, { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "9d222141b00156509d67d80c771fbefa92c43ace", "status": "affected", "versionType": "git" }, { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "ef277ae121b3249c99994652210a326b52d527b0", "status": "affected", "versionType": "git" }, { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "36561b86cb2501647662cfaf91286dd6973804a6", "status": "affected", "versionType": "git" }, { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3", "status": "affected", "versionType": "git" }, { "version": "342a93247e0837101f27bbcca26f402902df98dc", "lessThan": "6402078bd9d1ed46e79465e1faaa42e3458f8a33", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/smsc/smc91x.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.198", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.160", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.4", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.198" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1c4cb705e733250d13243f6a69b8b5a92e39b9f6" }, { "url": "https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace" }, { "url": "https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0" }, { "url": "https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6" }, { "url": "https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3" }, { "url": "https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33" } ], "title": "smc91x: fix broken irq-context in PREEMPT_RT", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2025-71132", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-06-10T20:42:13.928914Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-11T18:44:20.820Z" } } ] } }