{
  "cveId": "CVE-2026-43087",
  "url": "https://patchblox.com/security/cve/CVE-2026-43087",
  "summary": "CVE-2026-43087 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43087 (version 6.19.14-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  pinctrl: mcp23s08: Disable all pin interrupts du...",
  "description": "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\u0027t 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 \u002BPAN -UAO -TCO -DIT -SSBS BTYPE=--) [    8.094639] pc : _raw_spin_lock_irq\u002B0x40/0x80 [    8.098970] lr : handle_nested_irq\u002B0x2c/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\u002B0x40/0x80 (P) [    8.184443]  mcp23s08_irq\u002B0x248/0x358 [    8.184462]  irq_thread_fn\u002B0x34/0xb8 [    8.184470]  irq_thread\u002B0x1a4/0x310 [    8.195093]  kthread\u002B0x13c/0x150 [    8.198309]  ret_from_fork\u002B0x10/0x20 [    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 \u0022f9f4fda15e72\u0022 (\u0022pinctrl: mcp23s08: init reg_defaults from HW at probe and switch cache type\u0022), 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.",
  "published": "2026-05-06T10:16:21Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00107,
  "epssPercentile": 0.0116,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.14-1",
      "fix": "DEBIAN-CVE-2026-43087",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43087",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}