CVE-2026-93240memcg: make the v1 soft limit knob inert
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e9d4e1ee788097484606c32122f146d802a9c5fb before 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203; from e9d4e1ee788097484606c32122f146d802a9c5fb before 0a90e268cce7023f34087bfa4affb42e29ff5f45; from e9d4e1ee788097484606c32122f146d802a9c5fb before 5ec8f629a300cc40e746d6178f724bdff7683fa7; from e9d4e1ee788097484606c32122f146d802a9c5fb before a3417097fb107cea3358b19bcbb4eb655fd67f8c | CNA record |
References
- https://git.kernel.org/stable/c/72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203
- https://git.kernel.org/stable/c/0a90e268cce7023f34087bfa4affb42e29ff5f45
- https://git.kernel.org/stable/c/5ec8f629a300cc40e746d6178f724bdff7683fa7
- https://git.kernel.org/stable/c/a3417097fb107cea3358b19bcbb4eb655fd67f8c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.