CVE-2026-45843Network attack vector

Kernel memory disclosure via unchecked compressed-header decoding

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds reads in the Linux Kernel SLIP decompressor allow remote attackers to disclose kernel memory via VJ-compressed frames. In slhc_uncompress(), decode() and pull16() advance past the compressed packet length, while decode() masks away the -1 exhaustion result tested by callers. A remote PPP or SLIP peer must send a short frame requesting optional fields; over-read bytes can expose adjacent kernel memory and corrupt cached headers, without a reported crash or write primitive.

CVSS severity8.2
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds reads in the Linux Kernel SLIP decompressor allow remote attackers to disclose kernel memory via VJ-compressed frames. In slhc_uncompress(), decode() and pull16() advance past the compressed packet length, while decode() masks away the -1 exhaustion result tested by callers. A remote PPP or SLIP peer must send a short frame requesting optional fields; over-read bytes can expose adjacent kernel memory and corrupt cached headers, without a reported crash or write primitive.

The record

CVE
CVE-2026-45843
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37537e42e6df387398bee85cb85070cc80bb1e10
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4cefe32639933d652614b0bd50f818f9af4af78f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d42bec6e4f6d6d658be365539400b3314b76b2a7
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37537e42e6df387398bee85cb85070cc80bb1e10; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4cefe32639933d652614b0bd50f818f9af4af78f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d42bec6e4f6d6d658be365539400b3314b76b2a7; version=2.6.12

Published CVSS scores

8.2Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo