CVE-2026-99062 (GCVE-0-2026-99062)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:23 – Updated: 2026-10-23 12:23
VLAI
Title
vsock/virtio: account only unread bytes in read_skb()
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6971 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7893a41deaf28b53036d4ea7cd9f7d54e8874dfc , < e4a0028b0d54b2c45e1dc8c0dd95fe3e9236f55b (git)
Affected: 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 , < 38bad3930b1185dd6c98db3dd342ddc123c6f3ef (git)
Affected: 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 , < dd4b2f88ee517f9629d0d3dbfced02ffbc33e2dc (git)
Affected: 45ca7e9f0730ae36fc610e675b990e9cc9ca0714 , < a463f55c791b96cfd12df8b10ea737d45c80bb18 (git)
Affected: 17bada47e9ac3621c28e0ffa89af8279fedea00a (git)
Affected: 6.12.34 , < 6.12.113 (semver)
Affected: 6.15.3 , < 6.16 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: account only unread bytes in read_skb()\n\nAfter a partial stream receive, rx_bytes tracks the unread suffix while\nbuf_used and peer credit still cover the whole packet.\nvirtio_transport_read_skb() dequeues that packet but passes pkt_len for\nboth counters, underflowing rx_bytes.\n\nOn a connected CID_LOCAL stream with an SK_SKB verdict, a 40-byte read\nfrom a 100-byte packet made SIOCINQ report -40, an empty recv return\nELOOP, and poll report the empty socket readable.  After verdict detach,\nreceiving 40 bytes wrapped the counter to zero and hid those queued bytes\nuntil one more byte arrived.  The fixed run kept the counter balanced\nand exposed all queued data immediately.\n\nThis was found during an LLM-assisted manual source audit of VSOCK\nreceive accounting while re-evaluating virtio_transport_read_skb() after\nCVE-2024-50169.\n\nSubtract only skb-\u003elen minus the VSOCK offset from rx_bytes.  Retain the\nfull packet length for buf_used and peer credit."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:23:03.360Z",
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        "shortName": "Linux"
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        },
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      "title": "vsock/virtio: account only unread bytes in read_skb()",
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    "datePublished": "2026-10-23T12:23:03.360Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
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    "state": "PUBLISHED"
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      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vsock/virtio: account only unread bytes in read_skb()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99062.json",
      "version": "1"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: account only unread bytes in read_skb()\n\nAfter a partial stream receive, rx_bytes tracks the unread suffix while\nbuf_used and peer credit still cover the whole packet.\nvirtio_transport_read_skb() dequeues that packet but passes pkt_len for\nboth counters, underflowing rx_bytes.\n\nOn a connected CID_LOCAL stream with an SK_SKB verdict, a 40-byte read\nfrom a 100-byte packet made SIOCINQ report -40, an empty recv return\nELOOP, and poll report the empty socket readable.  After verdict detach,\nreceiving 40 bytes wrapped the counter to zero and hid those queued bytes\nuntil one more byte arrived.  The fixed run kept the counter balanced\nand exposed all queued data immediately.\n\nThis was found during an LLM-assisted manual source audit of VSOCK\nreceive accounting while re-evaluating virtio_transport_read_skb() after\nCVE-2024-50169.\n\nSubtract only skb-\u003elen minus the VSOCK offset from rx_bytes.  Retain the\nfull packet length for buf_used and peer credit."
          }
        ],
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        "metrics": {},
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      "cve": "CVE-2026-99062",
      "id": "CVE-2026-99062",
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}



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