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CVE-2026-23069— vsock/virtio: fix potential underflow in virtio_transport_get_credit()

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，该漏洞源于无符号算术下溢，可能导致数据队列过多。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 06a8fc78367d070720af960dcecec917d3ae5f3b< d96de882d6b99955604669d962ae14e94b66a551 affected
06a8fc78367d070720af960dcecec917d3ae5f3b< 02f9af192b98d15883c70dd41ac76d1b0217c899 affected
06a8fc78367d070720af960dcecec917d3ae5f3b< d05bc313788f0684b27f0f5b60c52a844669b542 affected
06a8fc78367d070720af960dcecec917d3ae5f3b< ec0f1b3da8061be3173d1c39faaf9504f91942c3 affected
06a8fc78367d070720af960dcecec917d3ae5f3b< 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 affected
4.8 affected
< 4.8 unaffected
6.1.162≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-23069

Vulnerability Information
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Vulnerability Title
vsock/virtio: fix potential underflow in virtio_transport_get_credit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential underflow in virtio_transport_get_credit() The credit calculation in virtio_transport_get_credit() uses unsigned arithmetic: ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); If the peer shrinks its advertised buffer (peer_buf_alloc) while bytes are in flight, the subtraction can underflow and produce a large positive value, potentially allowing more data to be queued than the peer can handle. Reuse virtio_transport_has_space() which already handles this case and add a comment to make it clear why we are doing that. [Stefano: use virtio_transport_has_space() instead of duplicating the code] [Stefano: tweak the commit message]
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，该漏洞源于无符号算术下溢，可能导致数据队列过多。
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 06a8fc78367d070720af960dcecec917d3ae5f3b ~ d96de882d6b99955604669d962ae14e94b66a551 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-23069

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III. Intelligence Information for CVE-2026-23069

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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-2026-23065 platform/x86/amd: Fix memory leak in wbrf_record()
CVE-2026-23064 net/sched: act_ife: avoid possible NULL deref
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-2026-23059 scsi: qla2xxx: Sanitize payload size to prevent member overflow
CVE-2026-23058 can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
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-2026-23060 crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

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-2026-23069

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