cbcvebase.
CVE-2024-57889
published 2025-01-15

CVE-2024-57889: In the Linux kernel, the following vulnerability has been resolved: pinctrl: mcp23s08: Fix sleeping in atomic context due to regmap locking If a device uses…

PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.16%
5.9th percentile
In the Linux kernel, the following vulnerability has been resolved: pinctrl: mcp23s08: Fix sleeping in atomic context due to regmap locking If a device uses MCP23xxx IO expander to receive IRQs, the following bug can happen: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:283 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, ... preempt_count: 1, expected: 0 ... Call Trace: ... __might_resched+0x104/0x10e __might_sleep+0x3e/0x62 mutex_lock+0x20/0x4c regmap_lock_mutex+0x10/0x18 regmap_update_bits_base+0x2c/0x66 mcp23s08_irq_set_type+0x1ae/0x1d6 __irq_set_trigger+0x56/0x172 __setup_irq+0x1e6/0x646 request_threaded_irq+0xb6/0x160 ... We observed the problem while experimenting with a touchscreen driver which used MCP23017 IO expander (I2C). The regmap in the pinctrl-mcp23s08 driver uses a mutex for protection from concurrent accesses, which is the default for regmaps without .fast_io, .disable_locking, etc. mcp23s08_irq_set_type() calls regmap_update_bits_base(), and the latter locks the mutex. However, __setup_irq() locks desc->lock spinlock before calling these functions. As a result, the system tries to lock the mutex whole holding the spinlock. It seems, the internal regmap locks are not needed in this driver at all. mcp->lock seems to protect the regmap from concurrent accesses already, except, probably, in mcp_pinconf_get/set. mcp23s08_irq_set_type() and mcp23s08_irq_mask/unmask() are called under chip_bus_lock(), which calls mcp23s08_irq_bus_lock(). The latter takes mcp->lock and enables regmap caching, so that the potentially slow I2C accesses are deferred until chip_bus_unlock(). The accesses to the regmap from mcp23s08_probe_one() do not need additional locking. In all remaining places where the regmap is accessed, except mcp_pinconf_get/set(), the driver already takes mcp->lock. This patch adds locking in mcp_pinconf_get/set() and disables internal locking in the regmap config. Among other things, it fixes the sleepin

Affected

24 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.124-1 (bookworm)linux 6.1.124-1 (bookworm)
debianlinux-6.1< linux 6.1.124-1 (bookworm)linux 6.1.124-1 (bookworm)
linuxlinux
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < 788d9e9a41b81893d6bb8faa05f045c975278318788d9e9a41b81893d6bb8faa05f045c975278318
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < c55d186376a87b468c9ee30f2195e0f3857f61a0c55d186376a87b468c9ee30f2195e0f3857f61a0
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < 9372e160d8211a7e17f2abff8370794f182df7859372e160d8211a7e17f2abff8370794f182df785
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < 0310cbad163a908d09d99c26827859365cd71fcb0310cbad163a908d09d99c26827859365cd71fcb
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < 8c6fd5803b988a5e78c9b9e42c70a936d7cfc6ec8c6fd5803b988a5e78c9b9e42c70a936d7cfc6ec
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < 830f838589522404cd7c2f0f540602f25034af61830f838589522404cd7c2f0f540602f25034af61
linuxlinux>= 8f38910ba4f662222157ce07a0d5becc4328c46a < a37eecb705f33726f1fb7cd2a67e514a15dfe693a37eecb705f33726f1fb7cd2a67e514a15dfe693
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.124-16.1.124-1
linuxlinux_kernel>= 0 < 6.12.9-16.12.9-1
linuxlinux_kernel>= 0 < 6.12.9-16.12.9-1
linuxlinux_kernel>= 0 < 5.4.0-211.2315.4.0-211.231
linuxlinux_kernel>= 0 < 5.15.0-135.1465.15.0-135.146
linuxlinux_kernel>= 0 < 6.8.0-60.636.8.0-60.63
linuxlinux_kernel>= 4.13 < 5.4.2895.4.289
linuxlinux_kernel>= 5.11 < 5.15.1765.15.176
linuxlinux_kernel>= 5.16 < 6.1.1246.1.124
linuxlinux_kernel>= 5.5 < 5.10.2335.10.233
linuxlinux_kernel>= 6.2 < 6.6.706.6.70
linuxlinux_kernel>= 6.7 < 6.12.96.12.9

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.