Socket buffer leak in Linux kernel Xen netfront driver
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel from 4.4.159 before 4.5, from 4.9.130 before 4.10, from 4.14.73 before 4.15, from 4.18.11 before 4.19, and from 4.19 is affected in the xen/netfront driver. When a response chain has more slots than fit in the skb's frags, the error path never frees the skb, so the skb and the pages attached to it as frags leak. The Xen backend decides how many slots it sends, so each overflowing chain leaks memory.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: xen/netfront: don't leak the skb when xennet_fill_frags() fails When a response chain has more slots than fit in the skb's frags, xennet_fill_frags() returns an error and xennet_poll() jumps to its error path. That path moves what's left on tmpq to errq to be freed, but the skb being filled was already dequeued from tmpq, so it's never freed. Each chain that overflows leaks the skb and the pages attached to it as frags, and the backend decides how many slots it sends. Put the skb back on tmpq before taking the error path, like the xennet_set_skb_gso() failure just above it does.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.4.159 to before 4.5; 4.9.130 to before 4.10; 4.14.73 to before 4.15; 4.18.11 to before 4.19 | 4.5, 4.10, 4.15, 4.19 | Patch available | CNA |
| Linux | Linux | 4.19 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 4.4.159 to before 4.5; 4.9.130 to before 4.10; 4.14.73 to before 4.15; 4.18.11 to before 4.19 Fixed in 4.5, 4.10, 4.15, 4.19 Patch available CNA
- Linux VendorLinux Affected 4.19 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11, 7.3 Patch available CNA
Remediation
For the Linux kernel, fixed versions are 4.5, 4.10, 4.15, 4.19, 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11 and 7.3. Red Hat rates this Low, has no fix planned for Red Hat Enterprise Linux 6, and lists no fix available for Red Hat Enterprise Linux 9 and 10 and for Red Hat OpenShift Container Platform 4 and 5.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
- Fix · CNA Linux (Linux) Fixed in 4.5, 4.10, 4.15, 4.19
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.57, 7.2.11, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. 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 6 | Affected | No fix planned: Out of support scope |
| 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: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-23 Threatist record created from CVE-2026-99057
- 2026-10-23 Alias added: GHSA-32c4-hc77-g5cm
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-27 CVSS score added · Red Hat
- 2026-10-30 Fix available: Linux/Linux@0cf0a25a639c535146c5eb4480d256995721aed6, Linux/[email protected], Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/6e6bd1051daabc327233c3ca3d00613fc6783c8e
- https://git.kernel.org/stable/c/0cf0a25a639c535146c5eb4480d256995721aed6
- https://git.kernel.org/stable/c/53a131eb2a998c77e2851401b32b712d6c6e8487
- https://git.kernel.org/stable/c/5051df031144753d3e18862514969146b601d089
- https://git.kernel.org/stable/c/99011a11c97340ef7290df7dc199305c73fab2f2
- https://git.kernel.org/stable/c/086944c1c2cbb683543bc3ff08637847b03c8009
- https://git.kernel.org/stable/c/84e3ea6502b5f14ce8d499d0b6e0e38386274cf0
- https://git.kernel.org/stable/c/93ccaf1c26e2133396173b76a071e59024daa622
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Sources
- CVE-2026-99057 · CVE Program
- CVE-2026-99057 · NVD
- FIRST EPSS
- GHSA-32c4-hc77-g5cm · GitHub Advisory Database · CC BY 4.0
- CVE-2026-99057 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences