CVE-2026-80848Hinoki check available

Kernel use-after-free via socket-close race

Published Sep 4, 2026 · Updated Sep 4, 2026

Use-after-free in Linux kernel espintcp sockets from 5.6 allows attackers to trigger a stale skb read by racing socket closure. espintcp_close() frees emsg->skb without a socket lock while xfrm_trans_reinject work can pass the same buffer to skb_send_sock_locked(). Reachability requires an espintcp socket-close race with pending reinjection work; the upstream notice does not publish a further consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux kernel espintcp sockets from 5.6 allows attackers to trigger a stale skb read by racing socket closure. espintcp_close() frees emsg->skb without a socket lock while xfrm_trans_reinject work can pass the same buffer to skb_send_sock_locked(). Reachability requires an espintcp socket-close race with pending reinjection work; the upstream notice does not publish a further consequence.

The record

CVE
CVE-2026-80848
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=5.6
  2. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <24efebecf415ba264adba0f0491cec436463a14f
  3. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <29121c5e6591da527e8e36ddac7120dc527f574d
  4. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4b31a875693c480c611519faca46216514e3e052
  5. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4bc0dfa28dca6fc0084203732695968049c44072
  6. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <54b41ad14da9a981131ab6e4d3f79321a503ea5d
  7. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <deb232e884877bf10b4ce2580909eedec986c284
  8. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <eb3bbf29c723fe75c0eb92be14f0ec92971fe272
  9. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ed5d9102190c45fc70121c036b0626b740040b75
  10. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ff8dd7a932f34409a56e1b91a1219340f17457e9

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <24efebecf415ba264adba0f0491cec436463a14f; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <29121c5e6591da527e8e36ddac7120dc527f574d; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4b31a875693c480c611519faca46216514e3e052; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4bc0dfa28dca6fc0084203732695968049c44072; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <54b41ad14da9a981131ab6e4d3f79321a503ea5d; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <deb232e884877bf10b4ce2580909eedec986c284; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <eb3bbf29c723fe75c0eb92be14f0ec92971fe272; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ed5d9102190c45fc70121c036b0626b740040b75; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <ff8dd7a932f34409a56e1b91a1219340f17457e9

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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