VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-45838: Linux kernel · bpf: fix end-of-list detection in cgroup_storage_get_next_key()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fc39753b7f92e09177777e9c648afe5aa3abb81f : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in fc39753b7f92e09177777e9c648afe5aa3abb81f, b4b5a20bed82130da2f2818f04d52378952fbd0b, 5828b9e5b272ecff7cf5d345128d3de7324117f7 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < fc39753b7f92e09177777e9c648afe5aa3abb81f	Fixed in fc39753b7f92e09177777e9c648afe5aa3abb81f
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < b4b5a20bed82130da2f2818f04d52378952fbd0b	Fixed in b4b5a20bed82130da2f2818f04d52378952fbd0b
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < 5828b9e5b272ecff7cf5d345128d3de7324117f7	Fixed in 5828b9e5b272ecff7cf5d345128d3de7324117f7
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < 85a2f30e40f7468db732f55659bc6318874f49af	Fixed in 85a2f30e40f7468db732f55659bc6318874f49af
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < 32ce55d424395904986f5066f8755f6cb9993377	Fixed in 32ce55d424395904986f5066f8755f6cb9993377
LinuxLinux	Affected ≥ de9cbbaadba5adf88a19e46df61f7054000838f6, < 26d3339e465e54107bd85884341d1609c5300d6a	Fixed in 26d3339e465e54107bd85884341d1609c5300d6a

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

References

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