CVE-2026-90157

Kernel warning via unchecked negative getsockopt length

Published Sep 17, 2026 · Updated Sep 17, 2026

Input validation in Linux cgroup getsockopt allows local users to trigger a hardened usercopy warning via a negative BPF option length. The __cgroup_bpf_run_filter_getsockopt_kern() function checks only the upper bound, allowing a negative ctx->optlen to reach copy_to_sockptr() as an unsigned size through TCP_ZEROCOPY_RECEIVE. Triggering requires control of a cgroup getsockopt BPF program; the upstream disclosure establishes a warning, not arbitrary code execution or a demonstrated system crash.

CVSS severity2.3
Low
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation in Linux cgroup getsockopt allows local users to trigger a hardened usercopy warning via a negative BPF option length. The __cgroup_bpf_run_filter_getsockopt_kern() function checks only the upper bound, allowing a negative ctx->optlen to reach copy_to_sockptr() as an unsigned size through TCP_ZEROCOPY_RECEIVE. Triggering requires control of a cgroup getsockopt BPF program; the upstream disclosure establishes a warning, not arbitrary code execution or a demonstrated system crash.

The record

CVE
CVE-2026-90157
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=08f61a34913558e06576e7b6318bf583f273c1be <5b09d984b38b018b123c3a9e02a96bbc6468dbe5
  2. Affected versionversion=5.10.188 <5.10.270
  3. Affected versionversion=5.12
  4. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <1b5aacd5b2419b0790e955e466d389a61c79b4b1
  5. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <2bdbe00454200fcb0110f31eeca8d906a3515e74
  6. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <31a89af4f513d750fec196e2bb6195a7d4473e9f
  7. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <554ba7195c4108726450e24480c8449990c2268c
  8. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <d02a12b4085ffe41ea750b1007f7a9c7aee2875a
  9. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2
  10. Affected versionversion=9cacf81f8161111db25f98e78a7a0e32ae142b3f <f68671b1a98d426c57864bd457c125fee14ac1a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=08f61a34913558e06576e7b6318bf583f273c1be <5b09d984b38b018b123c3a9e02a96bbc6468dbe5; version=5.10.188 <5.10.270; version=5.12; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <1b5aacd5b2419b0790e955e466d389a61c79b4b1; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <2bdbe00454200fcb0110f31eeca8d906a3515e74; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <31a89af4f513d750fec196e2bb6195a7d4473e9f; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <554ba7195c4108726450e24480c8449990c2268c; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <d02a12b4085ffe41ea750b1007f7a9c7aee2875a; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2; version=9cacf81f8161111db25f98e78a7a0e32ae142b3f <f68671b1a98d426c57864bd457c125fee14ac1a5

Published CVSS scores

7.1TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
7.2TenableAV:L/AC:L/Au:N/C:C/I:C/A:C
6.5TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:U/RL:U/RC:C
2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
7.1TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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