# CVE-2026-64465: usb: xhci: Fix sleep in atomic context in xhci_free_streams()

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

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

usb: xhci: Fix sleep in atomic context in xhci_free_streams()

When a USB device with active stream endpoints is disconnected,
xhci_free_streams() is called from the hub_event workqueue to
free the stream resources.  It calls xhci_free_stream_info()
while holding xhci->lock with irqs disabled.

xhci_free_stream_info() invokes xhci_free_stream_ctx(), which
calls dma_free_coherent() for large stream context arrays.

dma_free_coherent() can sleep (e.g. via vunmap), triggering
a BUG when called from atomic context.

Call trace:
 dma_free_attrs+0x174/0x220
 xhci_free_stream_info+0xd0/0x11c
 xhci_free_streams+0x278/0x37c
 usb_free_streams+0x98/0xc0
 usb_unbind_interface+0x1b8/0x2f8
 device_release_driver_internal+0x1d4/0x2cc
 device_release_driver+0x18/0x28
 bus_remove_device+0x160/0x1a4
 device_del+0x1ec/0x350
 usb_disable_device+0x98/0x214
 usb_disconnect+0xf0/0x35c
 hub_event+0xab4/0x19ec
 process_one_work+0x278/0x63c

Fix this by saving the stream_info pointers and clearing the
ep references under the lock, then calling xhci_free_stream_info()
outside the lock where sleeping is allowed.

## 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/10666ac9c552990204e791af653abf8e9d9ff619
- 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/1e45aa722c4ce5663e987102aac18c8ad6a83fdd
- 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/42c37c4b75d38b51d84f31a8e29427f5e06a7c2a
- 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/93cd037da94fcb93183bfb2457e3a56d3eb4c8f4
- 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/d107eb316144c5fb958486e7fe604cd7f1b35cda
- 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/e623e4a203f56d5c57519a9a3cb29600551534ad
- 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/f7b022ae07685e7526fc39f387ce65b5d309dd3b
- 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/f90586129cf9e1fbdb718ef602eea3f15dc1c31c

## Affected products and versions

- Linux / Linux: ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < e623e4a203f56d5c57519a9a3cb29600551534ad (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < d107eb316144c5fb958486e7fe604cd7f1b35cda (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < 1e45aa722c4ce5663e987102aac18c8ad6a83fdd (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < 10666ac9c552990204e791af653abf8e9d9ff619 (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < f7b022ae07685e7526fc39f387ce65b5d309dd3b (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < f90586129cf9e1fbdb718ef602eea3f15dc1c31c (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < 93cd037da94fcb93183bfb2457e3a56d3eb4c8f4 (affected, git); ≥ 8df75f42f8e67e2851cdcf6da91640fb881defd1; < 42c37c4b75d38b51d84f31a8e29427f5e06a7c2a (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.35 (affected); ≥ 0; < 2.6.35 (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); ≥ 6.12.96; ≤ 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": "2.6.35",
            "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": "6.12.96",
            "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
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:*",
            "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-667

## Exploit evidence

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

## References

- https://git.kernel.org/stable/c/e623e4a203f56d5c57519a9a3cb29600551534ad (CNA: Linux)

- https://git.kernel.org/stable/c/d107eb316144c5fb958486e7fe604cd7f1b35cda (CNA: Linux)

- https://git.kernel.org/stable/c/1e45aa722c4ce5663e987102aac18c8ad6a83fdd (CNA: Linux)

- https://git.kernel.org/stable/c/10666ac9c552990204e791af653abf8e9d9ff619 (CNA: Linux)

- https://git.kernel.org/stable/c/f7b022ae07685e7526fc39f387ce65b5d309dd3b (CNA: Linux)

- https://git.kernel.org/stable/c/f90586129cf9e1fbdb718ef602eea3f15dc1c31c (CNA: Linux)

- https://git.kernel.org/stable/c/93cd037da94fcb93183bfb2457e3a56d3eb4c8f4 (CNA: Linux)

- https://git.kernel.org/stable/c/42c37c4b75d38b51d84f31a8e29427f5e06a7c2a (CNA: Linux)

- https://git.kernel.org/stable/c/10666ac9c552990204e791af653abf8e9d9ff619 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/1e45aa722c4ce5663e987102aac18c8ad6a83fdd (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/42c37c4b75d38b51d84f31a8e29427f5e06a7c2a (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/93cd037da94fcb93183bfb2457e3a56d3eb4c8f4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/d107eb316144c5fb958486e7fe604cd7f1b35cda (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/e623e4a203f56d5c57519a9a3cb29600551534ad (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/f7b022ae07685e7526fc39f387ce65b5d309dd3b (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/f90586129cf9e1fbdb718ef602eea3f15dc1c31c (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-64465; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64465; retrieved 2026-11-12; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-64465; retrieved 2026-11-12; source updated Not reported

Revision: 0d9d472bf09f12113df9243a4d67dd6d3b2e9a69a65d3e84188af9cf32cd3dbc

Canonical: https://y2.dev/cve/CVE-2026-64465

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