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CVE-2026-99062— vsock/virtio: account only unread bytes in read_skb()

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.

在 Linux 内核中，以下漏洞已得到修复： vsock/virtio：在 read_skb() 中仅统计未读取的字节数 在发生部分流接收后，rx_bytes 跟踪的是未读取的后缀部分，而 buf_used 和 peer credit（对端信用额度）仍覆盖整个数据包。virtio_transport_read_skb() 在出队该数据包时，却将 pkt_len 同时用于上述两个计数器，导致 rx_bytes 发生下溢。 在 CID_LOCAL 已连接的流上，若存在 SK_SKB 判决（verdict），从一个 10

AI Predicted 7.8 Difficulty: Moderate EPSS 0.17% · P6

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 7893a41deaf28b53036d4ea7cd9f7d54e8874dfc< e4a0028b0d54b2c45e1dc8c0dd95fe3e9236f55b affected
45ca7e9f0730ae36fc610e675b990e9cc9ca0714< 38bad3930b1185dd6c98db3dd342ddc123c6f3ef affected
45ca7e9f0730ae36fc610e675b990e9cc9ca0714< dd4b2f88ee517f9629d0d3dbfced02ffbc33e2dc affected
45ca7e9f0730ae36fc610e675b990e9cc9ca0714< a463f55c791b96cfd12df8b10ea737d45c80bb18 affected
17bada47e9ac3621c28e0ffa89af8279fedea00a affected
6.12.34< 6.12.113 affected
6.15.3< 6.16 affected
6.16 affected
… +5 more rows
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I. Basic Information for CVE-2026-99062

Vulnerability Information
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Vulnerability Title
vsock/virtio: account only unread bytes in read_skb()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: account only unread bytes in read_skb() After a partial stream receive, rx_bytes tracks the unread suffix while buf_used and peer credit still cover the whole packet. virtio_transport_read_skb() dequeues that packet but passes pkt_len for both counters, underflowing rx_bytes. On a connected CID_LOCAL stream with an SK_SKB verdict, a 40-byte read from a 100-byte packet made SIOCINQ report -40, an empty recv return ELOOP, and poll report the empty socket readable. After verdict detach, receiving 40 bytes wrapped the counter to zero and hid those queued bytes until one more byte arrived. The fixed run kept the counter balanced and exposed all queued data immediately. This was found during an LLM-assisted manual source audit of VSOCK receive accounting while re-evaluating virtio_transport_read_skb() after CVE-2024-50169. Subtract only skb->len minus the VSOCK offset from rx_bytes. Retain the full packet length for buf_used and peer credit.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7893a41deaf28b53036d4ea7cd9f7d54e8874dfc ~ e4a0028b0d54b2c45e1dc8c0dd95fe3e9236f55b -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-99062

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III. Intelligence Information for CVE-2026-99062

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Patches & Fixes for CVE-2026-99062 (4)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-99014 7.8 HIGH Bluetooth: hci_sync: Fix command skb lifetime during scan setup
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-99018 7.8 HIGH riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99051 7.8 HIGH fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections
CVE-2026-99053 7.8 HIGH tipc: hold a reference to nodes found by link name

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux