# CVE-2026-64461: PCI: mediatek: Fix IRQ domain leak when port fails to enable

Status: published. Published: 2026-07-25. Updated: 2026-11-12.

In the Linux kernel, the following vulnerability has been resolved:

PCI: mediatek: Fix IRQ domain leak when port fails to enable

When mtk_pcie_enable_port() fails, mtk_pcie_port_free() removes the port
from pcie->ports and frees the port structure. However, the IRQ domains set
up earlier by mtk_pcie_init_irq_domain() are never freed.

Fix this by refactoring mtk_pcie_irq_teardown() into a per-port helper,
mtk_pcie_irq_teardown_port(), and calling it from mtk_pcie_setup() when
mtk_pcie_enable_port() fails. Since the IRQ teardown must only happen in
the probe error path (during resume, child devices may have active MSI
mappings and the NOIRQ context prohibits sleeping locks),
mtk_pcie_enable_port() is changed to return an error code so callers can
distinguish the two paths and act accordingly.

This issue was reported by Sashiko while reviewing the EcoNet EN7528 SoC
support series.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/1fbe8972a39548a633d06d7b03a01b7b119a2c12
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/6e6a529d6f779413379b4404c9ef6a36c0337225
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/ce52e494a7555bdae1d990a2654fd7547ef6d986
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/df77314b3bedbd9ad5d6f0682f98b99e3c5f7e2e
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/e23da72ef202654a7d5269885c4fa39a8404db76
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/ec7c05eed47d8b15c45380aee7ca168a82e15035
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/f865a57896bd92d7662eb2818d8f48872e2cbbc7
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/fe8c701a53c2816cd82301f66c671d952003c1b0

## Affected products and versions

- Linux / Linux: ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < e23da72ef202654a7d5269885c4fa39a8404db76 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < ec7c05eed47d8b15c45380aee7ca168a82e15035 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < 1fbe8972a39548a633d06d7b03a01b7b119a2c12 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < fe8c701a53c2816cd82301f66c671d952003c1b0 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < ce52e494a7555bdae1d990a2654fd7547ef6d986 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < 6e6a529d6f779413379b4404c9ef6a36c0337225 (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < df77314b3bedbd9ad5d6f0682f98b99e3c5f7e2e (affected, git); ≥ b099631df160ec608cd6147f4d20a8042567a5b8; < f865a57896bd92d7662eb2818d8f48872e2cbbc7 (affected, git). Source: CNA: Linux
- Linux / Linux: 4.14 (affected); ≥ 0; < 4.14 (unaffected, semver); ≥ 5.10.261; ≤ 5.10.* (unaffected, semver); ≥ 5.15.212; ≤ 5.15.* (unaffected, semver); ≥ 6.1.178; ≤ 6.1.* (unaffected, semver); ≥ 6.6.145; ≤ 6.6.* (unaffected, semver); ≥ 6.12.97; ≤ 6.12.* (unaffected, semver); ≥ 6.18.39; ≤ 6.18.* (unaffected, semver); ≥ 7.1.4; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.10.261",
            "versionStartIncluding": "4.14",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.15.212",
            "versionStartIncluding": "5.11",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.1.178",
            "versionStartIncluding": "5.16",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.6.145",
            "versionStartIncluding": "6.2",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.12.97",
            "versionStartIncluding": "6.7",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.18.39",
            "versionStartIncluding": "6.13",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "7.1.4",
            "versionStartIncluding": "6.19",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: nvd@nist.gov

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-10; percentile 8.11%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-401

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/e23da72ef202654a7d5269885c4fa39a8404db76 (CNA: Linux)

- https://git.kernel.org/stable/c/ec7c05eed47d8b15c45380aee7ca168a82e15035 (CNA: Linux)

- https://git.kernel.org/stable/c/1fbe8972a39548a633d06d7b03a01b7b119a2c12 (CNA: Linux)

- https://git.kernel.org/stable/c/fe8c701a53c2816cd82301f66c671d952003c1b0 (CNA: Linux)

- https://git.kernel.org/stable/c/ce52e494a7555bdae1d990a2654fd7547ef6d986 (CNA: Linux)

- https://git.kernel.org/stable/c/6e6a529d6f779413379b4404c9ef6a36c0337225 (CNA: Linux)

- https://git.kernel.org/stable/c/df77314b3bedbd9ad5d6f0682f98b99e3c5f7e2e (CNA: Linux)

- https://git.kernel.org/stable/c/f865a57896bd92d7662eb2818d8f48872e2cbbc7 (CNA: Linux)

- https://git.kernel.org/stable/c/1fbe8972a39548a633d06d7b03a01b7b119a2c12 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/6e6a529d6f779413379b4404c9ef6a36c0337225 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/ce52e494a7555bdae1d990a2654fd7547ef6d986 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/df77314b3bedbd9ad5d6f0682f98b99e3c5f7e2e (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/e23da72ef202654a7d5269885c4fa39a8404db76 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/ec7c05eed47d8b15c45380aee7ca168a82e15035 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/f865a57896bd92d7662eb2818d8f48872e2cbbc7 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/fe8c701a53c2816cd82301f66c671d952003c1b0 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-64461; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64461; retrieved 2026-11-12; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-64461; retrieved 2026-11-12; source updated Not reported

Revision: dbcd88747b9852c95bcadfa92803e44bbc8a29f1d2efd1c04b05d9dbb6ff7f32

Canonical: https://y2.dev/cve/CVE-2026-64461

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