CVE-2026-43211 (GCVE-0-2026-43211)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-08-05 12:26
VLAI
Title
PCI: Fix pci_slot_trylock() error handling
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: Fix pci_slot_trylock() error handling Commit a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()") delegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in pci_slot_trylock(), but it forgets to remove the corresponding pci_dev_unlock() when pci_bus_trylock() fails. Before a4e772898f8b, the code did: if (!pci_dev_trylock(dev)) /* <- lock bridge device */ goto unlock; if (dev->subordinate) { if (!pci_bus_trylock(dev->subordinate)) { pci_dev_unlock(dev); /* <- unlock bridge device */ goto unlock; } } After a4e772898f8b the bridge-device lock is no longer taken, but the pci_dev_unlock(dev) on the failure path was left in place, leading to the bug. This yields one of two errors: 1. A warning that the lock is being unlocked when no one holds it. 2. An incorrect unlock of a lock that belongs to another thread. Fix it by removing the now-redundant pci_dev_unlock(dev) on the failure path. [Same patch later posted by Keith at https://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e2355d513b89a2cb511b4ded0deb426cdb01acd0 , < ebb27b7399ab8b9eb1f792b329aa5f6250c590d4 (git)
Affected: 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945 , < fbe06a3058114bf95a17a4941b205f4b321c6f0a (git)
Affected: 7253b4fed46471cc247c6cacefac890a8472c083 , < 943ed56606a7ab2fe5a99cad572dd17d484310c7 (git)
Affected: 78c6e39fef5c428960aff742149bba302dd46f5a , < a19b61fdb958ffadbba85b43c991eb9fc70c1c1c (git)
Affected: a4e772898f8bf2e7e1cf661a12c60a5612c4afab , < 0425aaf20b407d2f2cf3bf469808e4a35f9abb8b (git)
Affected: a4e772898f8bf2e7e1cf661a12c60a5612c4afab , < bd435f4b738130d732ef64e0e57e45185f77165d (git)
Affected: a4e772898f8bf2e7e1cf661a12c60a5612c4afab , < 8b08ea9690b212b7bf7f12414039259cf34b1aa0 (git)
Affected: a4e772898f8bf2e7e1cf661a12c60a5612c4afab , < 9368d1ee62829b08aa31836b3ca003803caf0b72 (git)
Affected: 0790b89c7e911003b8c50ae50e3ac7645de1fae9 (git)
Affected: df77a678c33871a6e4ac5b54a71662f1d702335b (git)
Affected: 81c68e218ab883dfa368460a59b674084c0240da (git)
Affected: 5.10.226 , < 5.10.252 (semver)
Affected: 5.15.167 , < 5.15.202 (semver)
Affected: 6.1.110 , < 6.1.165 (semver)
Affected: 6.6.51 , < 6.6.128 (semver)
Affected: 4.19.322 , < 4.20 (semver)
Affected: 5.4.284 , < 5.5 (semver)
Affected: 6.10.10 , < 6.11 (semver)
Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix pci_slot_trylock() error handling\n\nCommit a4e772898f8b (\"PCI: Add missing bridge lock to pci_bus_lock()\")\ndelegates the bridge device\u0027s pci_dev_trylock() to pci_bus_trylock() in\npci_slot_trylock(), but it forgets to remove the corresponding\npci_dev_unlock() when pci_bus_trylock() fails.\n\nBefore a4e772898f8b, the code did:\n\n  if (!pci_dev_trylock(dev)) /* \u003c- lock bridge device */\n    goto unlock;\n  if (dev-\u003esubordinate) {\n    if (!pci_bus_trylock(dev-\u003esubordinate)) {\n      pci_dev_unlock(dev);   /* \u003c- unlock bridge device */\n      goto unlock;\n    }\n  }\n\nAfter a4e772898f8b the bridge-device lock is no longer taken, but the\npci_dev_unlock(dev) on the failure path was left in place, leading to the\nbug.\n\nThis yields one of two errors:\n\n  1. A warning that the lock is being unlocked when no one holds it.\n  2. An incorrect unlock of a lock that belongs to another thread.\n\nFix it by removing the now-redundant pci_dev_unlock(dev) on the failure\npath.\n\n[Same patch later posted by Keith at\nhttps://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]"
        }
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          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through local PCI reset interfaces, most plausibly VFIO PCI hot reset on an assigned device or privileged PCI reset paths. It is not exposed through network packet processing or an adjacent/physical protocol parser.\nAC:L - The failure path requires lock contention, but a local attacker with access to reset-capable PCI interfaces can create concurrent reset/config-lock activity with repeated attempts. Under the required higher-severity rule, this is treated as attacker-controlled race complexity.\nPR:L - Although some sysfs PCI reset paths require real administrative control, VFIO PCI device access can be delegated to a non-root local user or VM management process without CAP_SYS_ADMIN in the vulnerable ioctl path. Therefore the highest defensible scenario is low privileges rather than high.\nUI:N - Once the attacker has access to the local PCI/VFIO reset interface, exploitation only requires issuing concurrent operations. No separate victim user action is needed.\nS:U - The bug corrupts kernel PCI locking state within the same host kernel security authority. This is treated as standard local kernel compromise/DoS rather than a demonstrated cross-scope escape.\nC:H - The incorrect unlock can release a PCI device/config-access lock held by another thread, breaking kernel mutual exclusion during reset and driver callbacks. Given the possibility of repeated controlled races and kernel state corruption, confidentiality impact is scored high under the higher-severity rule.\nI:H - Incorrectly unlocking another thread\u0027s PCI device lock can allow concurrent modification of PCI device, driver, and reset state while code assumes exclusive access. This can plausibly lead to kernel state corruption or control-flow-relevant corruption, so integrity is high.\nA:H - The documented immediate outcomes include WARN conditions and invalid lock ownership/unlock behavior, which can oops, panic, deadlock, or destabilize PCI reset paths. Repeated triggering can cause host kernel availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:36.454Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ebb27b7399ab8b9eb1f792b329aa5f6250c590d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbe06a3058114bf95a17a4941b205f4b321c6f0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/943ed56606a7ab2fe5a99cad572dd17d484310c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/a19b61fdb958ffadbba85b43c991eb9fc70c1c1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0425aaf20b407d2f2cf3bf469808e4a35f9abb8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd435f4b738130d732ef64e0e57e45185f77165d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b08ea9690b212b7bf7f12414039259cf34b1aa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9368d1ee62829b08aa31836b3ca003803caf0b72"
        }
      ],
      "title": "PCI: Fix pci_slot_trylock() error handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43211",
    "datePublished": "2026-05-06T11:28:14.423Z",
    "dateReserved": "2026-05-01T14:12:55.993Z",
    "dateUpdated": "2026-08-05T12:26:36.454Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43211",
      "date": "2026-08-14",
      "epss": "0.00107",
      "percentile": "0.0131"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T12:16:40.527\",\"lastModified\":\"2026-06-17T10:49:09.683\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI: Fix pci_slot_trylock() error handling\\n\\nCommit a4e772898f8b (\\\"PCI: Add missing bridge lock to pci_bus_lock()\\\")\\ndelegates the bridge device\u0027s pci_dev_trylock() to pci_bus_trylock() in\\npci_slot_trylock(), but it forgets to remove the corresponding\\npci_dev_unlock() when pci_bus_trylock() fails.\\n\\nBefore a4e772898f8b, the code did:\\n\\n  if (!pci_dev_trylock(dev)) /* \u003c- lock bridge device */\\n    goto unlock;\\n  if (dev-\u003esubordinate) {\\n    if (!pci_bus_trylock(dev-\u003esubordinate)) {\\n      pci_dev_unlock(dev);   /* \u003c- unlock bridge device */\\n      goto unlock;\\n    }\\n  }\\n\\nAfter a4e772898f8b the bridge-device lock is no longer taken, but the\\npci_dev_unlock(dev) on the failure path was left in place, leading to the\\nbug.\\n\\nThis yields one of two errors:\\n\\n  1. A warning that the lock is being unlocked when no one holds it.\\n  2. An incorrect unlock of a lock that belongs to another thread.\\n\\nFix it by removing the now-redundant pci_dev_unlock(dev) on the failure\\npath.\\n\\n[Same patch later posted by Keith at\\nhttps://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/pci/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e2355d513b89a2cb511b4ded0deb426cdb01acd0\",\"lessThan\":\"ebb27b7399ab8b9eb1f792b329aa5f6250c590d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945\",\"lessThan\":\"fbe06a3058114bf95a17a4941b205f4b321c6f0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7253b4fed46471cc247c6cacefac890a8472c083\",\"lessThan\":\"943ed56606a7ab2fe5a99cad572dd17d484310c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"78c6e39fef5c428960aff742149bba302dd46f5a\",\"lessThan\":\"a19b61fdb958ffadbba85b43c991eb9fc70c1c1c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4e772898f8bf2e7e1cf661a12c60a5612c4afab\",\"lessThan\":\"0425aaf20b407d2f2cf3bf469808e4a35f9abb8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4e772898f8bf2e7e1cf661a12c60a5612c4afab\",\"lessThan\":\"bd435f4b738130d732ef64e0e57e45185f77165d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4e772898f8bf2e7e1cf661a12c60a5612c4afab\",\"lessThan\":\"8b08ea9690b212b7bf7f12414039259cf34b1aa0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a4e772898f8bf2e7e1cf661a12c60a5612c4afab\",\"lessThan\":\"9368d1ee62829b08aa31836b3ca003803caf0b72\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0790b89c7e911003b8c50ae50e3ac7645de1fae9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"df77a678c33871a6e4ac5b54a71662f1d702335b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81c68e218ab883dfa368460a59b674084c0240da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.226\",\"lessThan\":\"5.10.252\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.167\",\"lessThan\":\"5.15.202\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.110\",\"lessThan\":\"6.1.165\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.51\",\"lessThan\":\"6.6.128\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.322\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.284\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.10.10\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/pci/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.16\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.6\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.322\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"A3FCD7A0-ABE5-49E8-A47C-F0169215C4B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*: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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-02T17:20:40+00:00",
      "cve": "CVE-2026-43211",
      "id": "CVE-2026-43211",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: PCI: Fix pci_slot_trylock() error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43211.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T00:59:56Z",
      "cve": "CVE-2026-43211",
      "id": "CVE-2026-43211",
      "initial_release_date": "2026-05-08T02:20:13Z",
      "product_status:first_fixed": "68",
      "product_status:known_affected": "428",
      "product_status:known_not_affected": "134",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43211",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43211.json",
      "version": "7"
    }
  }
}



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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

Author Source Type Date Other

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.