VulnerabilityPublished 6 Oct 2026Updated 19 Oct 2026

CVE-2026-98274: Linux kernel · net: psp: avoid conflicts with skb->decrypted and sk_validate_xmit_skb()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c8c8c18862337c469e325c207601de3279847809 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c8c8c18862337c469e325c207601de3279847809, a41f24c612c3f5139a3143307eb85bbcf1bd4d07, a13cca5ba5375f13cbdab545abfb5e288bef3f78

Exploitation evidence

Disclosed: evidence found.
CVE published 6 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.

What to do

Upgrade Linux kernel to c8c8c18862337c469e325c207601de3279847809, a41f24c612c3f5139a3143307eb85bbcf1bd4d07 or a13cca5ba5375f13cbdab545abfb5e288bef3f78.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < c8c8c18862337c469e325c207601de3279847809	Fixed in c8c8c18862337c469e325c207601de3279847809
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < a41f24c612c3f5139a3143307eb85bbcf1bd4d07	Fixed in a41f24c612c3f5139a3143307eb85bbcf1bd4d07
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < a13cca5ba5375f13cbdab545abfb5e288bef3f78	Fixed in a13cca5ba5375f13cbdab545abfb5e288bef3f78
LinuxLinux	Affected =6.18	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel, as indicated by the fixed commit versions. Users should update to the patched kernel versions containing commits c8c8c18862337c469e325c207601de3279847809, a41f24c612c3f5139a3143307eb85bbcf1bd4d07, or a13cca5ba5375f13cbdab545abfb5e288bef3f78 to remediate this issue.

Description

A vulnerability in the Linux kernel's PSP (Packet Socket Protocol) subsystem caused conflicts with the TLS ULP (Upper Layer Protocol) due to shared usage of skb->decrypted and sk_validate_xmit_skb() fields. This issue has been resolved by making PSP mutually exclusive with TLS ULP and including all TCP ULPs in the relevant checks to prevent future conflicts.

Impact

The vulnerability could cause conflicts in kernel networking code related to PSP and TLS ULP, potentially leading to instability or unexpected behavior in packet processing. However, no known exploits in the wild have been reported, and the issue primarily affects kernel internal handling of socket buffers and transmission validation.

Summary

The Linux kernel contained a vulnerability where PSP conflicted with TLS ULP in its use of skb->decrypted and sk->sk_validate_xmit_skb(). This could lead to bugs due to overlapping usage of these fields. The fix involved making PSP mutually exclusive with TLS ULP, adding all TCP ULPs to the sk_has_decrypt_user() check, and closing off surface areas that could cause conflicts. The patch ensures that PSP is not used concurrently with TLS ULP or other TCP ULPs that might use these fields, preventing potential kernel networking issues.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:54 UTC

Technical details

References

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