CVE-2026-31415Public exploit

Local kernel panic via IPv6 option-length overflow

Published Apr 13, 2026 · Updated Apr 13, 2026

Integer overflow in the Linux Kernel IPv6 sendmsg ancillary-data path allows local users to crash the system with crafted control messages. ip6_datagram_send_ctl() repeatedly adds IPV6_DSTOPTS lengths to the 16-bit opt_flen field while retaining the final header pointer, so wrapping makes later headroom allocation too small for skb_push(). The path requires CAP_NET_RAW in the target network namespace; root can reach it directly, while an unprivileged local user also can when user namespaces are enabled, and the resulting underflow triggers a kernel BUG and panic.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the Linux Kernel IPv6 sendmsg ancillary-data path allows local users to crash the system with crafted control messages. ip6_datagram_send_ctl() repeatedly adds IPV6_DSTOPTS lengths to the 16-bit opt_flen field while retaining the final header pointer, so wrapping makes later headroom allocation too small for skb_push(). The path requires CAP_NET_RAW in the target network namespace; root can reach it directly, while an unprivileged local user also can when user namespaces are enabled, and the resulting underflow triggers a kernel BUG and panic.

The record

CVE
CVE-2026-31415
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.14
  2. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <0bdaf54d3aaddfe8df29371260fa8d4939b4fd6f
  3. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <4e453375561fc60820e6b9d8ebeb6b3ee177d42e
  4. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <5e4ee5dbea134e9257f205e31a96040bed71e83f
  5. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <63fda74885555e6bd1623b5d811feec998740ba4
  6. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <872b74900d5daa37067ac676d9001bb929fc6a2a
  7. Affected versionversion=333fad5364d6b457c8d837f7d05802d2aaf8a961 <9ed81d692758dfb9471d7799b24bfa7a08224c31

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.14; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <0bdaf54d3aaddfe8df29371260fa8d4939b4fd6f; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <4e453375561fc60820e6b9d8ebeb6b3ee177d42e; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <5e4ee5dbea134e9257f205e31a96040bed71e83f; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <63fda74885555e6bd1623b5d811feec998740ba4; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <872b74900d5daa37067ac676d9001bb929fc6a2a; version=333fad5364d6b457c8d837f7d05802d2aaf8a961 <9ed81d692758dfb9471d7799b24bfa7a08224c31

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.7SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

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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