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

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-08 12:41
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)
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.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ebb27b7399ab8b9eb1f792b329aa5f6250c590d4",
              "status": "affected",
              "version": "e2355d513b89a2cb511b4ded0deb426cdb01acd0",
              "versionType": "git"
            },
            {
              "lessThan": "fbe06a3058114bf95a17a4941b205f4b321c6f0a",
              "status": "affected",
              "version": "04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945",
              "versionType": "git"
            },
            {
              "lessThan": "943ed56606a7ab2fe5a99cad572dd17d484310c7",
              "status": "affected",
              "version": "7253b4fed46471cc247c6cacefac890a8472c083",
              "versionType": "git"
            },
            {
              "lessThan": "a19b61fdb958ffadbba85b43c991eb9fc70c1c1c",
              "status": "affected",
              "version": "78c6e39fef5c428960aff742149bba302dd46f5a",
              "versionType": "git"
            },
            {
              "lessThan": "0425aaf20b407d2f2cf3bf469808e4a35f9abb8b",
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "versionType": "git"
            },
            {
              "lessThan": "bd435f4b738130d732ef64e0e57e45185f77165d",
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "versionType": "git"
            },
            {
              "lessThan": "8b08ea9690b212b7bf7f12414039259cf34b1aa0",
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "versionType": "git"
            },
            {
              "lessThan": "9368d1ee62829b08aa31836b3ca003803caf0b72",
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0790b89c7e911003b8c50ae50e3ac7645de1fae9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "df77a678c33871a6e4ac5b54a71662f1d702335b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "81c68e218ab883dfa368460a59b674084c0240da",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "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": "5.10.252",
                  "versionStartIncluding": "5.10.226",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "5.15.167",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "6.1.110",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "6.6.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.322",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.284",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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]"
        }
      ],
      "metrics": [
        {
          "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T12:41:17.709Z",
        "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": "2026-05-08T12:41:17.709Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43211",
      "date": "2026-05-08",
      "epss": "0.00024",
      "percentile": "0.06984"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43211\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T12:16:40.527\",\"lastModified\":\"2026-05-08T13:16:45.480\",\"vulnStatus\":\"Undergoing Analysis\",\"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]\"}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0425aaf20b407d2f2cf3bf469808e4a35f9abb8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b08ea9690b212b7bf7f12414039259cf34b1aa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9368d1ee62829b08aa31836b3ca003803caf0b72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/943ed56606a7ab2fe5a99cad572dd17d484310c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a19b61fdb958ffadbba85b43c991eb9fc70c1c1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd435f4b738130d732ef64e0e57e45185f77165d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebb27b7399ab8b9eb1f792b329aa5f6250c590d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbe06a3058114bf95a17a4941b205f4b321c6f0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.