VulnerabilityPublished 23 Oct 2026

CVE-2026-99066: Linux kernel · can: dev: init_can_skb(): restore skb header initialization

Source GCVE Database

Authoritative record:CVE-2026-99066· High

Not known to be exploited : upgrade to 8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632 or 0a04c0cb8606ff88399489d03ef255afe90d0d5f soon.

Data as of 26 Oct 2026, 12:55 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632, 0a04c0cb8606ff88399489d03ef255afe90d0d5f

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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-4qj9-2gm5-pxqj

What to do

Upgrade Linux kernel to 8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632 or 0a04c0cb8606ff88399489d03ef255afe90d0d5f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9f10374bb024593a611e6845847f0444841a231b, < 8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632	Fixed in 8078375dfd0baecd9f1b7b06bb2d6f88d7cb8632
LinuxLinux	Affected ≥ 9f10374bb024593a611e6845847f0444841a231b, < 0a04c0cb8606ff88399489d03ef255afe90d0d5f	Fixed in 0a04c0cb8606ff88399489d03ef255afe90d0d5f
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix is available as the vulnerability has been resolved by restoring the skb header initialization in the Linux kernel source. Users should apply the official kernel update that includes commit 9f10374bb024 or later to remediate this issue. No additional mitigations are indicated.

Description

A vulnerability in the Linux kernel's CAN network subsystem was resolved by restoring skb header initialization in the init_can_skb() function. The issue was introduced when certain skb header reset calls were removed, causing RX skbs to carry an invalid mac_header value. This leads to an overflow in push length calculation in packet_rcv_spkt(), triggering a kernel panic and full machine crash. The problem was originally reported in 2014 and fixed then, but the recent commit reintroduced it. The vulnerability affects kernel stability and can cause denial of service via system crash.

References

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