{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-57889", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-57889", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2025-01-15T13:05:41.769Z", "updatedAt": "2026-05-11T20:59:51.473Z", "importedAt": "2026-10-24T01:57:20.494Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "pinctrl: mcp23s08: Fix sleeping in atomic context due to regmap locking", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: mcp23s08: Fix sleeping in atomic context due to regmap locking\n\nIf a device uses MCP23xxx IO expander to receive IRQs, the following\nbug can happen:\n\n BUG: sleeping function called from invalid context\n at kernel/locking/mutex.c:283\n in_atomic(): 1, irqs_disabled(): 1, non_block: 0, ...\n preempt_count: 1, expected: 0\n ...\n Call Trace:\n ...\n __might_resched+0x104/0x10e\n __might_sleep+0x3e/0x62\n mutex_lock+0x20/0x4c\n regmap_lock_mutex+0x10/0x18\n regmap_update_bits_base+0x2c/0x66\n mcp23s08_irq_set_type+0x1ae/0x1d6\n __irq_set_trigger+0x56/0x172\n __setup_irq+0x1e6/0x646\n request_threaded_irq+0xb6/0x160\n ...\n\nWe observed the problem while experimenting with a touchscreen driver which\nused MCP23017 IO expander (I2C).\n\nThe regmap in the pinctrl-mcp23s08 driver uses a mutex for protection from\nconcurrent accesses, which is the default for regmaps without .fast_io,\n.disable_locking, etc.\n\nmcp23s08_irq_set_type() calls regmap_update_bits_base(), and the latter\nlocks the mutex.\n\nHowever, __setup_irq() locks desc->lock spinlock before calling these\nfunctions. As a result, the system tries to lock the mutex whole holding\nthe spinlock.\n\nIt seems, the internal regmap locks are not needed in this driver at all.\nmcp->lock seems to protect the regmap from concurrent accesses already,\nexcept, probably, in mcp_pinconf_get/set.\n\nmcp23s08_irq_set_type() and mcp23s08_irq_mask/unmask() are called under\nchip_bus_lock(), which calls mcp23s08_irq_bus_lock(). The latter takes\nmcp->lock and enables regmap caching, so that the potentially slow I2C\naccesses are deferred until chip_bus_unlock().\n\nThe accesses to the regmap from mcp23s08_probe_one() do not need additional\nlocking.\n\nIn all remaining places where the regmap is accessed, except\nmcp_pinconf_get/set(), the driver already takes mcp->lock.\n\nThis patch adds locking in mcp_pinconf_get/set() and disables internal\nlocking in the regmap config. Among other things, it fixes the sleeping\nin atomic context described above.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "788d9e9a41b81893d6bb8faa05f045c975278318" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "c55d186376a87b468c9ee30f2195e0f3857f61a0" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "9372e160d8211a7e17f2abff8370794f182df785" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "0310cbad163a908d09d99c26827859365cd71fcb" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "8c6fd5803b988a5e78c9b9e42c70a936d7cfc6ec" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "830f838589522404cd7c2f0f540602f25034af61" }, { "version": "8f38910ba4f662222157ce07a0d5becc4328c46a", "status": "affected", "versionType": "git", "lessThan": "a37eecb705f33726f1fb7cd2a67e514a15dfe693" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.13", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.13" }, { "version": "5.4.289", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.233", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.176", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.124", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.70", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }