vsock/virtio: fix potential unbounded skb queue
Priority LOW 30CWE-400Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
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)
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00139 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.2, 6.12.94, 6.18.36 +2Red Hat: 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.1.63 to before 6.2 | 6.2 | Patch available | CNA |
| Linux | Linux | 6.3 and later | 6.12.94, 6.18.36, 7.0.13, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 6.1.63 to before 6.2 Fixed in 6.2 Patch available CNA
- Linux VendorLinux Affected 6.3 and later Fixed in 6.12.94, 6.18.36, 7.0.13, 7.1 Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.1.63 to before 6.2; 6.3.1 to before 6.12.94; 6.13 to before 6.18.36; 6.19 to before 7.0.13 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:-:*:*:*:*:*:* | 6.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc3:*:*:*:*:*:* | 6.3 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc4:*:*:*:*:*:* | 6.3 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc5:*:*:*:*:*:* | 6.3 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc6:*:*:*:*:*:* | 6.3 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc7:*:*:*:*:*:* | 6.3 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | 7.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | 7.1 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.1.63 to before 6.2; 6.3.1 to before 6.12.94; 6.13 to before 6.18.36; 6.19 to before 7.0.13 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:-:*:*:*:*:*:* Versions 6.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc3:*:*:*:*:*:* Versions 6.3 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc4:*:*:*:*:*:* Versions 6.3 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc5:*:*:*:*:*:* Versions 6.3 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc6:*:*:*:*:*:* Versions 6.3 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc7:*:*:*:*:*:* Versions 6.3 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.2
- Fix · CNA Linux (Linux) Fixed in 6.12.94, 6.18.36, 7.0.13, 7.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-53132
- 2026-10-03 Alias added: GHSA-g7xf-gg8w-vw6h
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-19 Weakness changed · CISA ADP
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score changed · Red Hat
References
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-53132 · CVE Program
- CVE-2026-53132 · NVD
- FIRST EPSS
- GHSA-g7xf-gg8w-vw6h · GitHub Advisory Database · CC BY 4.0
- CVE-2026-53132 · Red Hat security data · CC BY 4.0
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