Linux Kernel up to 6.12.93/6.18.35/7.0.12 vsock virtio_transport_inc_rx_pkt rx_bytes memory leak

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.96

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.93/6.18.35/7.0.12. This impacts the function virtio_transport_inc_rx_pkt of the component vsock. Executing a manipulation of the argument rx_bytes can lead to an unknown weakness. This vulnerability is registered as CVE-2026-53132. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.12.93/6.18.35/7.0.12. This vulnerability affects the function virtio_transport_inc_rx_pkt of the component vsock. The manipulation of the argument rx_bytes with an unknown input leads to a unknown weakness. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential unbounded skb queue virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc. virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM. If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0. Fix this by estimating the skb metadata size: (Number of skbs in the queue) * SKB_TRUESIZE(0)

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-53132 since 06/09/2026. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 327383 (Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1925)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.94, 6.18.36 or 7.0.13 eliminates this vulnerability. Applying the patch 1eca304f97a34ed5e921e1f0e06c8b241f25bf12/9bdc637fde66b63d6cad0caacd034888bb7bf5f5/100d5b2ffdc6468b9e48532641f29e83efdcb63c/059b7dbd20a6f0c539a45ddff1573cb8946685b5 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (327383), EUVD (EUVD-2026-39337) and CERT Bund (WID-SEC-2026-2077). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.1
CNA Vector (Linux): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 327383
Nessus Name: Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1925)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.94/6.18.36/7.0.13
Patch: 1eca304f97a34ed5e921e1f0e06c8b241f25bf12/9bdc637fde66b63d6cad0caacd034888bb7bf5f5/100d5b2ffdc6468b9e48532641f29e83efdcb63c/059b7dbd20a6f0c539a45ddff1573cb8946685b5

Timelineinfo

06/09/2026 CVE reserved
06/25/2026 +16 days Advisory disclosed
06/25/2026 +0 days VulDB entry created
07/18/2026 +23 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-53132 (🔒)
GCVE (CVE): GCVE-0-2026-53132
GCVE (VulDB): GCVE-100-373690
EUVD: 🔒
CERT Bund: WID-SEC-2026-2077 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 06/25/2026 11:44
Updated: 07/18/2026 11:10
Changes: 06/25/2026 11:44 (59), 06/25/2026 14:20 (1), 06/28/2026 22:58 (7), 07/03/2026 06:39 (11), 07/08/2026 07:15 (2), 07/18/2026 11:10 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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