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CVE-2026-23009— xhci: sideband: don't dereference freed ring when removing sideband endpoint

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用，可能导致内核崩溃。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.15% · P4

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux de66754e9f8029f8ae955a588959b99cab56b506< 34f6634dba87ef72b3c3a3a524be663adef7ab42 affected
de66754e9f8029f8ae955a588959b99cab56b506< dd83dc1249737b837ac5d57c81f2b0977c613d9f affected
6.16 affected
< 6.16 unaffected
6.18.7≤ 6.18.* unaffected
6.19≤ * unaffected
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I. Basic Information for CVE-2026-23009

Vulnerability Information
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Vulnerability Title
xhci: sideband: don't dereference freed ring when removing sideband endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xhci: sideband: don't dereference freed ring when removing sideband endpoint xhci_sideband_remove_endpoint() incorrecly assumes that the endpoint is running and has a valid transfer ring. Lianqin reported a crash during suspend/wake-up stress testing, and found the cause to be dereferencing a non-existing transfer ring 'ep->ring' during xhci_sideband_remove_endpoint(). The endpoint and its ring may be in unknown state if this function is called after xHCI was reinitialized in resume (lost power), or if device is being re-enumerated, disconnected or endpoint already dropped. Fix this by both removing unnecessary ring access, and by checking ep->ring exists before dereferencing it. Also make sure endpoint is running before attempting to stop it. Remove the xhci_initialize_ring_info() call during sideband endpoint removal as is it only initializes ring structure enqueue, dequeue and cycle state values to their starting values without changing actual hardware enqueue, dequeue and cycle state. Leaving them out of sync is worse than leaving it as it is. The endpoint will get freed in after this in most usecases. If the (audio) class driver want's to reuse the endpoint after offload then it is up to the class driver to ensure endpoint is properly set up.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux de66754e9f8029f8ae955a588959b99cab56b506 ~ 34f6634dba87ef72b3c3a3a524be663adef7ab42 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-23009

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III. Intelligence Information for CVE-2026-23009

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Same Patch Batch · Linux · 2026-01-25 · 20 CVEs total

CVE-2025-71162 7.8 HIGH dmaengine: tegra-adma: Fix use-after-free
CVE-2026-23010 7.8 HIGH ipv6: Fix use-after-free in inet6_addr_del().
CVE-2026-22999 7.8 HIGH net/sched: sch_qfq: do not free existing class in qfq_change_class()
CVE-2026-23001 7.8 HIGH macvlan: fix possible UAF in macvlan_forward_source()
CVE-2026-23004 7.8 HIGH dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()
CVE-2026-23003 7.5 HIGH ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()
CVE-2026-22997 7.5 HIGH net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the
CVE-2026-22998 7.5 HIGH nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec
CVE-2026-23013 7.0 HIGH net: octeon_ep_vf: fix free_irq dev_id mismatch in IRQ rollback
CVE-2026-23005 x86/fpu: Clear XSTATE_BV[i] in guest XSAVE state whenever XFD[i]=1
CVE-2026-23002 lib/buildid: use __kernel_read() for sleepable context
CVE-2026-23006 ASoC: tlv320adcx140: fix null pointer
CVE-2026-23000 net/mlx5e: Fix crash on profile change rollback failure
CVE-2026-23007 block: zero non-PI portion of auto integrity buffer
CVE-2026-23008 drm/vmwgfx: Fix KMS with 3D on HW version 10
CVE-2026-23011 ipv4: ip_gre: make ipgre_header() robust
CVE-2026-22996 net/mlx5e: Don't store mlx5e_priv in mlx5e_dev devlink priv
CVE-2025-71163 dmaengine: idxd: fix device leaks on compat bind and unbind
CVE-2026-23012 mm/damon/core: remove call_control in inactive contexts

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23009

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