{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43087", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.983Z", "datePublished": "2026-05-06T07:40:21.303Z", "dateUpdated": "2026-05-11T22:17:28.465Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:17:28.465Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: mcp23s08: Disable all pin interrupts during probe\n\nA chip being probed may have the interrupt-on-change feature enabled on\nsome of its pins, for example after a reboot. This can cause the chip to\ngenerate interrupts for pins that don't have a registered nested handler,\nwhich leads to a kernel crash such as below:\n\n[ 7.928897] Unable to handle kernel read from unreadable memory at virtual address 00000000000000ac\n[ 7.932314] Mem abort info:\n[ 7.935081] ESR = 0x0000000096000004\n[ 7.938808] EC = 0x25: DABT (current EL), IL = 32 bits\n[ 7.944094] SET = 0, FnV = 0\n[ 7.947127] EA = 0, S1PTW = 0\n[ 7.950247] FSC = 0x04: level 0 translation fault\n[ 7.955101] Data abort info:\n[ 7.957961] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n[ 7.963421] CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[ 7.968447] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[ 7.973734] user pgtable: 4k pages, 48-bit VAs, pgdp=00000000089b7000\n[ 7.980148] [00000000000000ac] pgd=0000000000000000, p4d=0000000000000000\n[ 7.986913] Internal error: Oops: 0000000096000004 [#1] SMP\n[ 7.992545] Modules linked in:\n[ 8.073678] CPU: 0 UID: 0 PID: 81 Comm: irq/18-4-0025 Not tainted 7.0.0-rc6-gd2b5a1f931c8-dirty #199\n[ 8.073689] Hardware name: Khadas VIM3 (DT)\n[ 8.073692] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 8.094639] pc : _raw_spin_lock_irq+0x40/0x80\n[ 8.098970] lr : handle_nested_irq+0x2c/0x168\n[ 8.098979] sp : ffff800082b2bd20\n[ 8.106599] x29: ffff800082b2bd20 x28: ffff800080107920 x27: ffff800080104d88\n[ 8.106611] x26: ffff000003298080 x25: 0000000000000001 x24: 000000000000ff00\n[ 8.113707] x23: 0000000000000001 x22: 0000000000000000 x21: 000000000000000e\n[ 8.120850] x20: 0000000000000000 x19: 00000000000000ac x18: 0000000000000000\n[ 8.135046] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\n[ 8.135062] x14: ffff800081567ea8 x13: ffffffffffffffff x12: 0000000000000000\n[ 8.135070] x11: 00000000000000c0 x10: 0000000000000b60 x9 : ffff800080109e0c\n[ 8.135078] x8 : 1fffe0000069dbc1 x7 : 0000000000000001 x6 : ffff0000034ede00\n[ 8.135086] x5 : 0000000000000000 x4 : ffff0000034ede08 x3 : 0000000000000001\n[ 8.163460] x2 : 0000000000000000 x1 : 0000000000000001 x0 : 00000000000000ac\n[ 8.170560] Call trace:\n[ 8.180094] _raw_spin_lock_irq+0x40/0x80 (P)\n[ 8.184443] mcp23s08_irq+0x248/0x358\n[ 8.184462] irq_thread_fn+0x34/0xb8\n[ 8.184470] irq_thread+0x1a4/0x310\n[ 8.195093] kthread+0x13c/0x150\n[ 8.198309] ret_from_fork+0x10/0x20\n[ 8.201850] Code: d65f03c0 d2800002 52800023 f9800011 (885ffc01)\n[ 8.207931] ---[ end trace 0000000000000000 ]---\n\nThis issue has always been present, but has been latent until commit\n\"f9f4fda15e72\" (\"pinctrl: mcp23s08: init reg_defaults from HW at probe and\nswitch cache type\"), which correctly removed reg_defaults from the regmap\nand as a side effect changed the behavior of the interrupt handler so that\nthe real value of the MCP_GPINTEN register is now being read from the chip\ninstead of using a bogus 0 default value; a non-zero value for this\nregister can trigger the invocation of a nested handler which may not exist\n(yet).\nFix this issue by disabling all pin interrupts during initialization." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/pinctrl/pinctrl-mcp23s08.c" ], "versions": [ { "version": "f9f4fda15e720686f1b2b436591ab11255e4e85e", "lessThan": "f8c3258541a0680a4ebc08b05b2bc5fdad3288a9", "status": "affected", "versionType": "git" }, { "version": "f9f4fda15e720686f1b2b436591ab11255e4e85e", "lessThan": "db5b8cecbdf479ad13156af750377e5b43853fab", "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/pinctrl/pinctrl-mcp23s08.c" ], "versions": [ { "version": "6.19", "status": "affected" }, { "version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.19", "versionEndExcluding": "6.19.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f8c3258541a0680a4ebc08b05b2bc5fdad3288a9" }, { "url": "https://git.kernel.org/stable/c/db5b8cecbdf479ad13156af750377e5b43853fab" } ], "title": "pinctrl: mcp23s08: Disable all pin interrupts during probe", "x_generator": { "engine": "bippy-1.2.0" } } } }