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

CVE-2026-99284: net: skbuff: propagate shared-frag marker in skb_zerocopy()

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 1a9c180cd8435917b7516edfb1c9148032c28773, 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3, 79dc34beb1fdb3da79753e51e15c68591a2561fe.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1a9c180cd8435917b7516edfb1c9148032c28773, 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3, 79dc34beb1fdb3da79753e51e15c68591a2561fe 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: net: skbuff: propagate shared-frag marker in skb_zerocopy() skb_zerocopy() moves frag descriptors from @from into @to and takes a reference on each frag, but it does not copy skb_shinfo(from)->flags into skb_shinfo(to)->flags. A destination skb holding the same page-cache backed frags as the source therefore reports skb_has_shared_frag() as false. That breaks the invariant relied on by later in-place writers. ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(); with the marker lost, an skb that skb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is decrypted in place, letting an unprivileged user write into the page cache of a root-owned read-only file. Propagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for the other frag-transfer helpers.

—No exploit Fix available
Published
Nov 7, 2026
Updated
Nov 10, 2026
EPSS
0.2% · 11th 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 · 0.2%

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Noroxi analysis

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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

    • 3.14affected
    • af2806f8f90a150160be898cd85332459c83c5cb and later · before fe8477e23dd2ee6bce231d65f2586a333b211dc0affected · git
    • af2806f8f90a150160be898cd85332459c83c5cb and later · before 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3affected · git
    • af2806f8f90a150160be898cd85332459c83c5cb and later · before d7d6ff98d5d1b400f02211f962ac32cc0020aeabaffected · git
    • af2806f8f90a150160be898cd85332459c83c5cb and later · before 1a9c180cd8435917b7516edfb1c9148032c28773affected · git
    • af2806f8f90a150160be898cd85332459c83c5cb and later · before 79dc34beb1fdb3da79753e51e15c68591a2561feaffected · git
    • before 3.14not affected · semver
    • 6.12.117 and later · up to and including 6.12.*not affected · semver
    • 6.18.61 and later · up to and including 6.18.*not affected · semver
    • 7.2.15 and later · up to and including 7.2.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.72.1.el10_26.12.0-211.72.1.el10_2

+96

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-2026-99282Nov 7, 2026 · net/sched: sch_teql: fix use-after-free on lower qdisc drop
    0Monitor
  • ← EarlierCVE-2026-99283Nov 7, 2026 · netfilter: conntrack: tcp: use UNACK timeout for non-closing RST packets
    0Monitor
  • Later →CVE-2026-99285Nov 10, 2026 · netfilter: nft_byteorder: remove multi-register support
    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 Linux1a9c180cd8435917b7516edfb1c9148032c28773Vendor (CNA)
Linux Linux1c623e3cbf43f12dd4a72712079bfa247a9b8ba3Vendor (CNA)
Linux Linux79dc34beb1fdb3da79753e51e15c68591a2561feVendor (CNA)
Linux Linuxd7d6ff98d5d1b400f02211f962ac32cc0020aeabVendor (CNA)
Linux Linuxfe8477e23dd2ee6bce231d65f2586a333b211dc0Vendor (CNA)
almalinux:bpftool4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.181.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.12.115-1 · 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 11, 2026+4 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 (4 more)

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

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