{"id":"DEBIAN-CVE-2026-43087","details":"In the Linux kernel, the following vulnerability has been resolved:  pinctrl: mcp23s08: Disable all pin interrupts during probe  A chip being probed may have the interrupt-on-change feature enabled on some of its pins, for example after a reboot. This can cause the chip to generate interrupts for pins that don't have a registered nested handler, which leads to a kernel crash such as below:  [    7.928897] Unable to handle kernel read from unreadable memory at virtual address 00000000000000ac [    7.932314] Mem abort info: [    7.935081]   ESR = 0x0000000096000004 [    7.938808]   EC = 0x25: DABT (current EL), IL = 32 bits [    7.944094]   SET = 0, FnV = 0 [    7.947127]   EA = 0, S1PTW = 0 [    7.950247]   FSC = 0x04: level 0 translation fault [    7.955101] Data abort info: [    7.957961]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [    7.963421]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [    7.968447]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [    7.973734] user pgtable: 4k pages, 48-bit VAs, pgdp=00000000089b7000 [    7.980148] [00000000000000ac] pgd=0000000000000000, p4d=0000000000000000 [    7.986913] Internal error: Oops: 0000000096000004 [#1]  SMP [    7.992545] Modules linked in: [    8.073678] CPU: 0 UID: 0 PID: 81 Comm: irq/18-4-0025 Not tainted 7.0.0-rc6-gd2b5a1f931c8-dirty #199 [    8.073689] Hardware name: Khadas VIM3 (DT) [    8.073692] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [    8.094639] pc : _raw_spin_lock_irq+0x40/0x80 [    8.098970] lr : handle_nested_irq+0x2c/0x168 [    8.098979] sp : ffff800082b2bd20 [    8.106599] x29: ffff800082b2bd20 x28: ffff800080107920 x27: ffff800080104d88 [    8.106611] x26: ffff000003298080 x25: 0000000000000001 x24: 000000000000ff00 [    8.113707] x23: 0000000000000001 x22: 0000000000000000 x21: 000000000000000e [    8.120850] x20: 0000000000000000 x19: 00000000000000ac x18: 0000000000000000 [    8.135046] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [    8.135062] x14: ffff800081567ea8 x13: ffffffffffffffff x12: 0000000000000000 [    8.135070] x11: 00000000000000c0 x10: 0000000000000b60 x9 : ffff800080109e0c [    8.135078] x8 : 1fffe0000069dbc1 x7 : 0000000000000001 x6 : ffff0000034ede00 [    8.135086] x5 : 0000000000000000 x4 : ffff0000034ede08 x3 : 0000000000000001 [    8.163460] x2 : 0000000000000000 x1 : 0000000000000001 x0 : 00000000000000ac [    8.170560] Call trace: [    8.180094]  _raw_spin_lock_irq+0x40/0x80 (P) [    8.184443]  mcp23s08_irq+0x248/0x358 [    8.184462]  irq_thread_fn+0x34/0xb8 [    8.184470]  irq_thread+0x1a4/0x310 [    8.195093]  kthread+0x13c/0x150 [    8.198309]  ret_from_fork+0x10/0x20 [    8.201850] Code: d65f03c0 d2800002 52800023 f9800011 (885ffc01) [    8.207931] ---[ end trace 0000000000000000 ]---  This issue has always been present, but has been latent until commit \"f9f4fda15e72\" (\"pinctrl: mcp23s08: init reg_defaults from HW at probe and switch cache type\"), which correctly removed reg_defaults from the regmap and as a side effect changed the behavior of the interrupt handler so that the real value of the MCP_GPINTEN register is now being read from the chip instead of using a bogus 0 default value; a non-zero value for this register can trigger the invocation of a nested handler which may not exist (yet). Fix this issue by disabling all pin interrupts during initialization.","modified":"2026-09-14T17:02:36.513344087Z","published":"2026-05-06T10:16:21.963Z","upstream":["CVE-2026-43087"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-43087"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.14-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43087.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}