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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-99057: xen/netfront: don't leak the skb when xennet_fill_frags() fails

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 086944c1c2cbb683543bc3ff08637847b03c8009, 0cf0a25a639c535146c5eb4480d256995721aed6, 4.10; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 086944c1c2cbb683543bc3ff08637847b03c8009, 0cf0a25a639c535146c5eb4480d256995721aed6, 4.10; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • bd1468048aa3e2af865da92990539946d4483989, 29a6193c0d74390c004808441061ac1812cf6f51, 7eced4478f4ec6ff0a603ddfd6e24a5d3831fca7, b73a161e9beff24bf1803ba393dff95a255268f9, 4.19affected
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 6e6bd1051daabc327233c3ca3d00613fc6783c8eaffected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 0cf0a25a639c535146c5eb4480d256995721aed6affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 53a131eb2a998c77e2851401b32b712d6c6e8487affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 5051df031144753d3e18862514969146b601d089affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 99011a11c97340ef7290df7dc199305c73fab2f2affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 086944c1c2cbb683543bc3ff08637847b03c8009affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 84e3ea6502b5f14ce8d499d0b6e0e38386274cf0affected · git
    • ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c and later · before 93ccaf1c26e2133396173b76a071e59024daa622affected · git
    • 4.4.159 and later · before 4.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.11-17.2.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99055Oct 23, 2026 · tcp: reject net_iov in zerocopy receive mapping hints
    0Monitor
  • ← EarlierCVE-2026-99056Oct 23, 2026 · strparser: make sure __strp_recv isn't running before tearing down the parser
    31Monitor
  • Later →CVE-2026-99058Oct 23, 2026 · workqueue: Fix NULL current_pwq deref in chained work check
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux086944c1c2cbb683543bc3ff08637847b03c8009Vendor (CNA)
Linux Linux0cf0a25a639c535146c5eb4480d256995721aed6Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.19Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux5051df031144753d3e18862514969146b601d089Vendor (CNA)
Linux Linux53a131eb2a998c77e2851401b32b712d6c6e8487Vendor (CNA)
Linux Linux6e6bd1051daabc327233c3ca3d00613fc6783c8eVendor (CNA)
Linux Linux84e3ea6502b5f14ce8d499d0b6e0e38386274cf0Vendor (CNA)
Linux Linux93ccaf1c26e2133396173b76a071e59024daa622Vendor (CNA)
Linux Linux99011a11c97340ef7290df7dc199305c73fab2f2Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+13 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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