CVE-2026-99062vsock/virtio: account only unread bytes in read_skb()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 23, 2026
- First seen by InfoSec Signals
- Oct 23, 2026
Affected products
Linux Linux linux:linux (from the name) | from 7893a41deaf28b53036d4ea7cd9f7d54e8874dfc before e4a0028b0d54b2c45e1dc8c0dd95fe3e9236f55b; 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 builds before 38bad3930b1185dd6c98db3dd342ddc123c6f3ef; from 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 before dd4b2f88ee517f9629d0d3dbfced02ffbc33e2dc; from 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 before a463f55c791b96cfd12df8b10ea737d45c80bb18; 17bada47e9ac3621c28e0ffa89af8279fedea00a; from 6.12.34 before 6.12.113; from 6.15.3 before 6.16 | CNA record |
References
- https://git.kernel.org/stable/c/e4a0028b0d54b2c45e1dc8c0dd95fe3e9236f55b
- https://git.kernel.org/stable/c/38bad3930b1185dd6c98db3dd342ddc123c6f3ef
- https://git.kernel.org/stable/c/dd4b2f88ee517f9629d0d3dbfced02ffbc33e2dc
- https://git.kernel.org/stable/c/a463f55c791b96cfd12df8b10ea737d45c80bb18
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.