VulnerabilityPublished 28 Oct 2026

CVE-2026-99127: Linux kernel · page_pool: keep frag_offset aligned for odd-sized requests

Source GCVE Database

Authoritative record:CVE-2026-99127

Not known to be exploited · fixed in dca1b51693c81eaf77e50980be373e01ae857394 : patch Linux kernel soon.

Data as of 28 Oct 2026, 14:13 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in dca1b51693c81eaf77e50980be373e01ae857394, dc0df5a0c62ccea1d0e08d39a4dc9064de81d411, 813a72beaa5d3f4bb135e0def9b3f07a3511ca0e

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-4j2x-r727-jfq6

What to do

Upgrade Linux kernel to dca1b51693c81eaf77e50980be373e01ae857394, dc0df5a0c62ccea1d0e08d39a4dc9064de81d411 or 813a72beaa5d3f4bb135e0def9b3f07a3511ca0e.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 53e0961da1c7bbdabd1abebb20de403ec237ec09, < dca1b51693c81eaf77e50980be373e01ae857394	Fixed in dca1b51693c81eaf77e50980be373e01ae857394
LinuxLinux	Affected ≥ 53e0961da1c7bbdabd1abebb20de403ec237ec09, < dc0df5a0c62ccea1d0e08d39a4dc9064de81d411	Fixed in dc0df5a0c62ccea1d0e08d39a4dc9064de81d411
LinuxLinux	Affected ≥ 53e0961da1c7bbdabd1abebb20de403ec237ec09, < 813a72beaa5d3f4bb135e0def9b3f07a3511ca0e	Fixed in 813a72beaa5d3f4bb135e0def9b3f07a3511ca0e
LinuxLinux	Affected =5.15	Fixed in–

AI-suggested

A patch has been applied to the Linux kernel to fix this vulnerability by aligning fragment sizes properly in the page pool allocator. Users should update their Linux kernel to a version that includes this fix. Since this is a kernel-level issue, applying the official kernel update is the recommended remediation. No additional mitigations or workarounds are indicated.

Description

CVE-2026-99127 is a Linux kernel vulnerability involving misalignment of fragment offsets in the page pool allocator for odd-sized requests. This misalignment can cause kernel panics due to split lock detection on x86 architectures when cloning socket buffers. The issue affects the per-CPU system_page_pool used by generic XDP and can be triggered by attaching an XDP program to loopback and opening a RAW IPPROTO_UDP socket. The vulnerability has been resolved by ensuring fragment sizes are aligned to the required DMA cache alignment, preventing misaligned fragment offsets and subsequent kernel panics.

Impact

The vulnerability can cause kernel panics due to split lock detection on x86 systems when cloning socket buffers that use the affected page pool allocator. This can lead to system instability and denial of service. The issue affects networking components using generic XDP and RAW IPPROTO_UDP sockets, with ordinary DNS traffic capable of triggering the panic. There is no indication of remote code execution or privilege escalation, but the kernel panic can disrupt normal system operation.

References

Community reviews

Loading reviews…