VulnerabilityPublished 24 Sep 2026Updated 21 Oct 2026

CVE-2026-93240: Linux kernel · memcg: make the v1 soft limit knob inert

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bf75f14d755f9cfbb246e6cc011b53cdd5142de3 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bf75f14d755f9cfbb246e6cc011b53cdd5142de3, a3417097fb107cea3358b19bcbb4eb655fd67f8c, 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 ≥ e9d4e1ee788097484606c32122f146d802a9c5fb, < bf75f14d755f9cfbb246e6cc011b53cdd5142de3	Fixed in bf75f14d755f9cfbb246e6cc011b53cdd5142de3
LinuxLinux	Affected ≥ e9d4e1ee788097484606c32122f146d802a9c5fb, < a3417097fb107cea3358b19bcbb4eb655fd67f8c	Fixed in a3417097fb107cea3358b19bcbb4eb655fd67f8c
LinuxLinux	Affected ≥ e9d4e1ee788097484606c32122f146d802a9c5fb, < 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203	Fixed in 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203
LinuxLinux	Affected ≥ e9d4e1ee788097484606c32122f146d802a9c5fb, < 5ec8f629a300cc40e746d6178f724bdff7683fa7	Fixed in 5ec8f629a300cc40e746d6178f724bdff7683fa7
LinuxLinux	Affected ≥ e9d4e1ee788097484606c32122f146d802a9c5fb, < 0a90e268cce7023f34087bfa4affb42e29ff5f45	Fixed in 0a90e268cce7023f34087bfa4affb42e29ff5f45
LinuxLinux	Affected =6.3	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: memcg: make the v1 soft limit knob inert The v1 soft limit has been deprecated since v6.12 and nobody has reported depending on it. Start the removal by decoupling the interface from the implementation: keep memory.soft_limit_in_bytes, but ignore writes to it and always report the maximum value on read similar to what memory.kmem.limit_in_bytes already does. Writes are still parsed, so malformed input keeps returning -EINVAL. The knob now also behaves the same everywhere: it used to return -EOPNOTSUPP on PREEMPT_RT, where soft limit reclaim has always been disabled. This also fixes the syzbot report linked below. Soft limit reclaim is the only caller that runs shrink_lruvec() from kswapd against a specific memcg, so it is the only way to reach lru_gen_shrink_lruvec() and in turn set_mm_walk(), which warns when called from kswapd.

References

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