memcg: make the v1 soft limit knob inert
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.
CVE-2026-93240
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93240
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e9d4e1ee788097484606c32122f146d802a9c5fb",
"lessThan": "bf75f14d755f9cfbb246e6cc011b53cdd5142de3",
"versionType": "git"
},
{
"status": "affected",
"version": "e9d4e1ee788097484606c32122f146d802a9c5fb",
"lessThan": "72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203",
"versionType": "git"
},
{
"status": "affected",
"version": "e9d4e1ee788097484606c32122f146d802a9c5fb",
"lessThan": "0a90e268cce7023f34087bfa4affb42e29ff5f45",
"versionType": "git"
},
{
"status": "affected",
"version": "e9d4e1ee788097484606c32122f146d802a9c5fb",
"lessThan": "5ec8f629a300cc40e746d6178f724bdff7683fa7",
"versionType": "git"
},
{
"status": "affected",
"version": "e9d4e1ee788097484606c32122f146d802a9c5fb",
"lessThan": "a3417097fb107cea3358b19bcbb4eb655fd67f8c",
"versionType": "git"
}
],
"programFiles": [
"Documentation/admin-guide/cgroup-v1/memory.rst",
"mm/memcontrol-v1.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"Documentation/admin-guide/cgroup-v1/memory.rst",
"mm/memcontrol-v1.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93240
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48740 · Revision 1
- Added to Heist Feed
- Publisher date