CVE-2022-48687

Kernel-memory disclosure via unchecked HMAC secret length

Published May 3, 2024 · Updated May 11, 2026

An out-of-bounds read in the Linux kernel SRv6 subsystem allows local users to disclose up to 64 bytes of kernel memory via netlink. seg6_genl_sethmac copies SECRETLEN bytes from SEG6_ATTR_SECRET without checking that the declared length does not exceed the secret attribute's actual length. Access to the local generic-netlink interface is required, and the disclosed bytes can be retrieved by dumping HMAC state; no integrity or availability impact is reported.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the Linux kernel SRv6 subsystem allows local users to disclose up to 64 bytes of kernel memory via netlink. seg6_genl_sethmac copies SECRETLEN bytes from SEG6_ATTR_SECRET without checking that the declared length does not exceed the secret attribute's actual length. Access to the local generic-netlink interface is required, and the disclosed bytes can be retrieved by dumping HMAC state; no integrity or availability impact is reported.

The record

CVE
CVE-2022-48687
Published
May 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.10
  2. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <076f2479fc5a15c4a970ca3b5e57d42ba09a31fa
  3. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <3df71e11a4773d775c3633c44319f7acdb89011c
  4. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <55195563ec29f80f984237b743de0e2b6ba4d093
  5. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <56ad3f475482bca55b0ae544031333018eb145b3
  6. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <84a53580c5d2138c7361c7c3eea5b31827e63b35
  7. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <dc9dbd65c803af1607484fed5da50d41dc8dd864
  8. Affected versionversion=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <f684c16971ed5e77dfa25a9ad25b5297e1f58eab

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <076f2479fc5a15c4a970ca3b5e57d42ba09a31fa; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <3df71e11a4773d775c3633c44319f7acdb89011c; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <55195563ec29f80f984237b743de0e2b6ba4d093; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <56ad3f475482bca55b0ae544031333018eb145b3; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <84a53580c5d2138c7361c7c3eea5b31827e63b35; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <dc9dbd65c803af1607484fed5da50d41dc8dd864; version=4f4853dc1c9c1994f6f756eabdcc25374ff271d9 <f684c16971ed5e77dfa25a9ad25b5297e1f58eab

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1005Data from Local System

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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