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CVE-2026-23069 (GCVE-0-2026-23069)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:07 – Updated: 2026-06-11 18:44
VLAI
Title
vsock/virtio: fix potential underflow in virtio_transport_get_credit()
Summary
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]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d96de882d6b99955604669d962ae14e94b66a551 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 02f9af192b98d15883c70dd41ac76d1b0217c899 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d05bc313788f0684b27f0f5b60c52a844669b542 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < ec0f1b3da8061be3173d1c39faaf9504f91942c3 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23069\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:41:19.172207Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:38:14.180Z\"}}], \"cna\": {\"title\": \"vsock/virtio: fix potential underflow in virtio_transport_get_credit()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"06a8fc78367d070720af960dcecec917d3ae5f3b\", \"lessThan\": \"d96de882d6b99955604669d962ae14e94b66a551\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06a8fc78367d070720af960dcecec917d3ae5f3b\", \"lessThan\": \"02f9af192b98d15883c70dd41ac76d1b0217c899\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06a8fc78367d070720af960dcecec917d3ae5f3b\", \"lessThan\": \"d05bc313788f0684b27f0f5b60c52a844669b542\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06a8fc78367d070720af960dcecec917d3ae5f3b\", \"lessThan\": \"ec0f1b3da8061be3173d1c39faaf9504f91942c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"06a8fc78367d070720af960dcecec917d3ae5f3b\", \"lessThan\": \"3ef3d52a1a9860d094395c7a3e593f3aa26ff012\", \"versionType\": \"git\"}], \"programFiles\": [\"net/vmw_vsock/virtio_transport_common.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.122\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.68\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/vmw_vsock/virtio_transport_common.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551\"}, {\"url\": \"https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899\"}, {\"url\": \"https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542\"}, {\"url\": \"https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3\"}, {\"url\": \"https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvsock/virtio: fix potential underflow in virtio_transport_get_credit()\\n\\nThe credit calculation in virtio_transport_get_credit() uses unsigned\\narithmetic:\\n\\n  ret = vvs-\u003epeer_buf_alloc - (vvs-\u003etx_cnt - vvs-\u003epeer_fwd_cnt);\\n\\nIf the peer shrinks its advertised buffer (peer_buf_alloc) while bytes\\nare in flight, the subtraction can underflow and produce a large\\npositive value, potentially allowing more data to be queued than the\\npeer can handle.\\n\\nReuse virtio_transport_has_space() which already handles this case and\\nadd a comment to make it clear why we are doing that.\\n\\n[Stefano: use virtio_transport_has_space() instead of duplicating the code]\\n[Stefano: tweak the commit message]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.122\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.68\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.8\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:59:23.999Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23069\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:11.093Z\", \"dateReserved\": \"2026-01-13T15:37:45.954Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-02-04T16:07:49.911Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.