CVE-2026-64465usb: xhci: Fix sleep in atomic context in xhci_free_streams()
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
- 6 days later
· 6 days later
First scored
Medium 5.5
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < e623e4a203f56d5c57519a9a3cb29600551534ad
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < d107eb316144c5fb958486e7fe604cd7f1b35cda
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < 1e45aa722c4ce5663e987102aac18c8ad6a83fdd
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < 10666ac9c552990204e791af653abf8e9d9ff619
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < f7b022ae07685e7526fc39f387ce65b5d309dd3b
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < f90586129cf9e1fbdb718ef602eea3f15dc1c31c
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < 93cd037da94fcb93183bfb2457e3a56d3eb4c8f4
- affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 – < 42c37c4b75d38b51d84f31a8e29427f5e06a7c2a
- affected 2.6.35
- unaffected < 2.6.35
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e623e4a203f56d5c57519a9a3cb29600551534ad (opens in a new tab)
- https://git.kernel.org/stable/c/d107eb316144c5fb958486e7fe604cd7f1b35cda (opens in a new tab)
- https://git.kernel.org/stable/c/1e45aa722c4ce5663e987102aac18c8ad6a83fdd (opens in a new tab)
- https://git.kernel.org/stable/c/10666ac9c552990204e791af653abf8e9d9ff619 (opens in a new tab)
- https://git.kernel.org/stable/c/f7b022ae07685e7526fc39f387ce65b5d309dd3b (opens in a new tab)
- https://git.kernel.org/stable/c/f90586129cf9e1fbdb718ef602eea3f15dc1c31c (opens in a new tab)
- https://git.kernel.org/stable/c/93cd037da94fcb93183bfb2457e3a56d3eb4c8f4 (opens in a new tab)
- https://git.kernel.org/stable/c/42c37c4b75d38b51d84f31a8e29427f5e06a7c2a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48809 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64465)Record last updated .