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CVE-2026-23058— can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak

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URB在完成回调中未被重新锚定，可能导致内存泄漏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 702171adeed3607ee9603ec30ce081411e36ae42< e2c71030dc464d437110bcfb367c493fd402bddb affected
702171adeed3607ee9603ec30ce081411e36ae42< f48eabd15194b216030b32445f44230df95f5fe0 affected
702171adeed3607ee9603ec30ce081411e36ae42< 61e6d3674c3d1da1475dc207b3e75c55d678d18e affected
702171adeed3607ee9603ec30ce081411e36ae42< e9410fdd4d5f7eaa6526d8c80e83029d7c86a8e8 affected
702171adeed3607ee9603ec30ce081411e36ae42< 46a191ff7eeec33a2ccb2a1bfea34e18fbc5dc1a affected
702171adeed3607ee9603ec30ce081411e36ae42< 68c62b3e53901846b5f68c5a8bade72a5d9c0b87 affected
702171adeed3607ee9603ec30ce081411e36ae42< 0ce73a0eb5a27070957b67fd74059b6da89cc516 affected
2.6.32 affected
… +8 more rows
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I. Basic Information for CVE-2026-23058

Vulnerability Information
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Vulnerability Title
can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak"). In ems_usb_open(), the URBs for USB-in transfers are allocated, added to the dev->rx_submitted anchor and submitted. In the complete callback ems_usb_read_bulk_callback(), the URBs are processed and resubmitted. In ems_usb_close() the URBs are freed by calling usb_kill_anchored_urbs(&dev->rx_submitted). However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in ems_usb_close(). Fix the memory leak by anchoring the URB in the ems_usb_read_bulk_callback() to the dev->rx_submitted anchor.
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URB在完成回调中未被重新锚定，可能导致内存泄漏。
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 702171adeed3607ee9603ec30ce081411e36ae42 ~ e2c71030dc464d437110bcfb367c493fd402bddb -
Linux Linux 2.6.32 -

II. Public POCs for CVE-2026-23058

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III. Intelligence Information for CVE-2026-23058

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Same Patch Batch · Linux · 2026-02-04 · 79 CVEs total

CVE-2026-23098 8.8 HIGH netrom: fix double-free in nr_route_frame()
CVE-2026-23066 7.8 HIGH rxrpc: Fix recvmsg() unconditional requeue
CVE-2026-23074 7.8 HIGH net/sched: Enforce that teql can only be used as root qdisc
CVE-2026-23077 7.8 HIGH mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
CVE-2026-23105 7.8 HIGH net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag
CVE-2026-23103 7.8 HIGH ipvlan: Make the addrs_lock be per port
CVE-2026-23095 7.5 HIGH gue: Fix skb memleak with inner IP protocol 0.
CVE-2025-71192 7.0 HIGH ALSA: ac97: fix a double free in snd_ac97_controller_register()
CVE-2026-23064 net/sched: act_ife: avoid possible NULL deref
CVE-2026-23065 platform/x86/amd: Fix memory leak in wbrf_record()
CVE-2026-23067 iommu/io-pgtable-arm: fix size_t signedness bug in unmap path
CVE-2026-23042 idpf: fix aux device unplugging when rdma is not supported by vport
CVE-2026-23060 crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec
CVE-2026-23059 scsi: qla2xxx: Sanitize payload size to prevent member overflow
CVE-2026-23057 vsock/virtio: Coalesce only linear skb
CVE-2026-23056 uacce: implement mremap in uacce_vm_ops to return -EPERM
CVE-2025-71199 iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
CVE-2025-71198 iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
CVE-2025-71197 w1: therm: Fix off-by-one buffer overflow in alarms_store
CVE-2026-23061 can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak

Showing top 20 of 79 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23058

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