Vulnerability-Lookup

FKIE_CVE-2026-23069

Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-03-13 21:27

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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]

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
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  "cveTags": [],
  "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]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvsock/virtio: soluciona un posible desbordamiento negativo en virtio_transport_get_credit()\n\nEl c\u00e1lculo de cr\u00e9dito en virtio_transport_get_credit() utiliza aritm\u00e9tica sin signo:\n\nret = vvs-\u0026gt;peer_buf_alloc - (vvs-\u0026gt;tx_cnt - vvs-\u0026gt;peer_fwd_cnt);\n\nSi el par reduce su b\u00fafer anunciado (peer_buf_alloc) mientras hay bytes en tr\u00e1nsito, la resta puede sufrir un desbordamiento negativo y producir un valor positivo grande, lo que podr\u00eda permitir que se pongan en cola m\u00e1s datos de los que el par puede manejar.\n\nReutilizar virtio_transport_has_space() que ya maneja este caso y a\u00f1adir un comentario para dejar claro por qu\u00e9 lo estamos haciendo.\n\n[Stefano: usar virtio_transport_has_space() en lugar de duplicar el c\u00f3digo]\n[Stefano: ajustar el mensaje de commit]"
    }
  ],
  "id": "CVE-2026-23069",
  "lastModified": "2026-03-13T21:27:26.643",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-02-04T17:16:17.610",
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      "tags": [
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}

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

Vulnerability from cvelistv5 – Published: 2026-02-04 16:07 – Updated: 2026-02-09 08:38

Title

vsock/virtio: fix potential underflow in virtio_transport_get_credit()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/d96de882d6b999556…
	https://git.kernel.org/stable/c/02f9af192b98d1588…
	https://git.kernel.org/stable/c/d05bc313788f0684b…
	https://git.kernel.org/stable/c/ec0f1b3da8061be31…
	https://git.kernel.org/stable/c/3ef3d52a1a9860d09…

Impacted products

Vendor

Product

Version

Linux

Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d96de882d6b99955604669d962ae14e94b66a551 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 02f9af192b98d15883c70dd41ac76d1b0217c899 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d05bc313788f0684b27f0f5b60c52a844669b542 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < ec0f1b3da8061be3173d1c39faaf9504f91942c3 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 (git)

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)

Show details on NVD website

JSON

To clipboard

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
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    "datePublished": "2026-02-04T16:07:49.911Z",
    "dateReserved": "2026-01-13T15:37:45.954Z",
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

FKIE_CVE-2026-23069

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

Tags

Sightings

Nomenclature