{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-46961", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.942Z", "datePublished": "2024-02-27T18:47:00.560Z", "dateUpdated": "2026-05-11T13:45:16.723Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:45:16.723Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nirqchip/gic-v3: Do not enable irqs when handling spurious interrups\n\nWe triggered the following error while running our 4.19 kernel\nwith the pseudo-NMI patches backported to it:\n\n[ 14.816231] ------------[ cut here ]------------\n[ 14.816231] kernel BUG at irq.c:99!\n[ 14.816232] Internal error: Oops - BUG: 0 [#1] SMP\n[ 14.816232] Process swapper/0 (pid: 0, stack limit = 0x(____ptrval____))\n[ 14.816233] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G O 4.19.95.aarch64 #14\n[ 14.816233] Hardware name: evb (DT)\n[ 14.816234] pstate: 80400085 (Nzcv daIf +PAN -UAO)\n[ 14.816234] pc : asm_nmi_enter+0x94/0x98\n[ 14.816235] lr : asm_nmi_enter+0x18/0x98\n[ 14.816235] sp : ffff000008003c50\n[ 14.816235] pmr_save: 00000070\n[ 14.816237] x29: ffff000008003c50 x28: ffff0000095f56c0\n[ 14.816238] x27: 0000000000000000 x26: ffff000008004000\n[ 14.816239] x25: 00000000015e0000 x24: ffff8008fb916000\n[ 14.816240] x23: 0000000020400005 x22: ffff0000080817cc\n[ 14.816241] x21: ffff000008003da0 x20: 0000000000000060\n[ 14.816242] x19: 00000000000003ff x18: ffffffffffffffff\n[ 14.816243] x17: 0000000000000008 x16: 003d090000000000\n[ 14.816244] x15: ffff0000095ea6c8 x14: ffff8008fff5ab40\n[ 14.816244] x13: ffff8008fff58b9d x12: 0000000000000000\n[ 14.816245] x11: ffff000008c8a200 x10: 000000008e31fca5\n[ 14.816246] x9 : ffff000008c8a208 x8 : 000000000000000f\n[ 14.816247] x7 : 0000000000000004 x6 : ffff8008fff58b9e\n[ 14.816248] x5 : 0000000000000000 x4 : 0000000080000000\n[ 14.816249] x3 : 0000000000000000 x2 : 0000000080000000\n[ 14.816250] x1 : 0000000000120000 x0 : ffff0000095f56c0\n[ 14.816251] Call trace:\n[ 14.816251] asm_nmi_enter+0x94/0x98\n[ 14.816251] el1_irq+0x8c/0x180 (IRQ C)\n[ 14.816252] gic_handle_irq+0xbc/0x2e4\n[ 14.816252] el1_irq+0xcc/0x180 (IRQ B)\n[ 14.816253] arch_timer_handler_virt+0x38/0x58\n[ 14.816253] handle_percpu_devid_irq+0x90/0x240\n[ 14.816253] generic_handle_irq+0x34/0x50\n[ 14.816254] __handle_domain_irq+0x68/0xc0\n[ 14.816254] gic_handle_irq+0xf8/0x2e4\n[ 14.816255] el1_irq+0xcc/0x180 (IRQ A)\n[ 14.816255] arch_cpu_idle+0x34/0x1c8\n[ 14.816255] default_idle_call+0x24/0x44\n[ 14.816256] do_idle+0x1d0/0x2c8\n[ 14.816256] cpu_startup_entry+0x28/0x30\n[ 14.816256] rest_init+0xb8/0xc8\n[ 14.816257] start_kernel+0x4c8/0x4f4\n[ 14.816257] Code: 940587f1 d5384100 b9401001 36a7fd01 (d4210000)\n[ 14.816258] Modules linked in: start_dp(O) smeth(O)\n[ 15.103092] ---[ end trace 701753956cb14aa8 ]---\n[ 15.103093] Kernel panic - not syncing: Fatal exception in interrupt\n[ 15.103099] SMP: stopping secondary CPUs\n[ 15.103100] Kernel Offset: disabled\n[ 15.103100] CPU features: 0x36,a2400218\n[ 15.103100] Memory Limit: none\n\nwhich is cause by a 'BUG_ON(in_nmi())' in nmi_enter().\n\nFrom the call trace, we can find three interrupts (noted A, B, C above):\ninterrupt (A) is preempted by (B), which is further interrupted by (C).\n\nSubsequent investigations show that (B) results in nmi_enter() being\ncalled, but that it actually is a spurious interrupt. Furthermore,\ninterrupts are reenabled in the context of (B), and (C) fires with\nNMI priority. We end-up with a nested NMI situation, something\nwe definitely do not want to (and cannot) handle.\n\nThe bug here is that spurious interrupts should never result in any\nstate change, and we should just return to the interrupted context.\nMoving the handling of spurious interrupts as early as possible in\nthe GICv3 handler fixes this issue.\n\n[maz: rewrote commit message, corrected Fixes: tag]" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/irqchip/irq-gic-v3.c" ], "versions": [ { "version": "3f1f3234bc2db1c16b9818b9a15a5d58ad45251c", "lessThan": "e7ea8e46e3b777be26aa855fe07778c415f24926", "status": "affected", "versionType": "git" }, { "version": "3f1f3234bc2db1c16b9818b9a15a5d58ad45251c", "lessThan": "7be4db5c2b59fa77071c93ca4329876fb9777202", "status": "affected", "versionType": "git" }, { "version": "3f1f3234bc2db1c16b9818b9a15a5d58ad45251c", "lessThan": "ea817ac1014c04f47885532b55f5d0898deadfba", "status": "affected", "versionType": "git" }, { "version": "3f1f3234bc2db1c16b9818b9a15a5d58ad45251c", "lessThan": "3f72d3709f53af72835af7dc8b15ba61611a0e36", "status": "affected", "versionType": "git" }, { "version": "3f1f3234bc2db1c16b9818b9a15a5d58ad45251c", "lessThan": "a97709f563a078e259bf0861cd259aa60332890a", "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/irqchip/irq-gic-v3.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.118", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.36", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.11.20", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.12.3", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.13", "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": "5.1", "versionEndExcluding": "5.4.118" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.10.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.11.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.12.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e7ea8e46e3b777be26aa855fe07778c415f24926" }, { "url": "https://git.kernel.org/stable/c/7be4db5c2b59fa77071c93ca4329876fb9777202" }, { "url": "https://git.kernel.org/stable/c/ea817ac1014c04f47885532b55f5d0898deadfba" }, { "url": "https://git.kernel.org/stable/c/3f72d3709f53af72835af7dc8b15ba61611a0e36" }, { "url": "https://git.kernel.org/stable/c/a97709f563a078e259bf0861cd259aa60332890a" } ], "title": "irqchip/gic-v3: Do not enable irqs when handling spurious interrups", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-04-22T16:01:28.614335Z", "id": "CVE-2021-46961", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-22T16:04:00.465Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.893Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/e7ea8e46e3b777be26aa855fe07778c415f24926", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/7be4db5c2b59fa77071c93ca4329876fb9777202", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/ea817ac1014c04f47885532b55f5d0898deadfba", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3f72d3709f53af72835af7dc8b15ba61611a0e36", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a97709f563a078e259bf0861cd259aa60332890a", "tags": [ "x_transferred" ] } ] } ] } }