CVE-2026-43087 (GCVE-0-2026-43087)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
pinctrl: mcp23s08: Disable all pin interrupts during probe
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f9f4fda15e720686f1b2b436591ab11255e4e85e , < f8c3258541a0680a4ebc08b05b2bc5fdad3288a9 (git)
Affected: f9f4fda15e720686f1b2b436591ab11255e4e85e , < db5b8cecbdf479ad13156af750377e5b43853fab (git)
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    Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pinctrl/pinctrl-mcp23s08.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f8c3258541a0680a4ebc08b05b2bc5fdad3288a9",
              "status": "affected",
              "version": "f9f4fda15e720686f1b2b436591ab11255e4e85e",
              "versionType": "git"
            },
            {
              "lessThan": "db5b8cecbdf479ad13156af750377e5b43853fab",
              "status": "affected",
              "version": "f9f4fda15e720686f1b2b436591ab11255e4e85e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/pinctrl/pinctrl-mcp23s08.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-06T07:40:21.303Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43087",
    "datePublished": "2026-05-06T07:40:21.303Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-06T07:40:21.303Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43087",
      "date": "2026-05-08",
      "epss": "0.00018",
      "percentile": "0.05027"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43087\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:21.963\",\"lastModified\":\"2026-05-06T13:08:07.970\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\u0027t 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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/db5b8cecbdf479ad13156af750377e5b43853fab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8c3258541a0680a4ebc08b05b2bc5fdad3288a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.