5.5

CVE-2026-23069

vsock/virtio: fix potential underflow in virtio_transport_get_credit()

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]
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.8 < 6.1.162
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.122
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.68
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.8
Linux ≫ Linux Kernel Version6.19 Updaterc1
Linux ≫ Linux Kernel Version6.19 Updaterc2
Linux ≫ Linux Kernel Version6.19 Updaterc3
Linux ≫ Linux Kernel Version6.19 Updaterc4
Linux ≫ Linux Kernel Version6.19 Updaterc5
Linux ≫ Linux Kernel Version6.19 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.026
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-191 Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899
Patch
https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542
Patch
https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3
Patch
https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012
Patch
https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551
Patch