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CVE-2026-89752— mm: memcg: stop reclaim when a limit update is superseded

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于并发更新memory.high或memory.max时，回收循环使用过时的写入者目标，可能导致写入者无限循环并错误记录OOM事件。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1093

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< ebf762a393630d1582645be3f0fc22a674eb9122 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 4ea0617b9e46d26c0a3e5af00308ea1931cc545d affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 5c6f87d33733d96fba66ea4e78cd8b24b4d60a49 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 8bf21ad3657305e28deafd9ef16a121407496bc3 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 39ec1e4183a718f448b2e9de681dcbdda18fce42 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 95d87030cae7764805aa7c621c52871139297cb0 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< aab391074de96ed601eeca32daef9a8507d436d9 affected
b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f< 9477820c63cbf4d97114238f3d1ff10dfd6bee3f affected
… +14 more rows
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I. Basic Information for CVE-2026-89752

Vulnerability Information
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Vulnerability Title
mm: memcg: stop reclaim when a limit update is superseded
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm: memcg: stop reclaim when a limit update is superseded kernfs serializes file operations only per open file, so separate open files can update the same memory.high or memory.max file concurrently. Both handlers store the new limit before synchronous reclaim, but continue to use the writer's local target in the reclaim loop. If another writer raises or removes the limit, the first writer can continue reclaiming toward a stale target. For memory.max, this can leave the writer looping indefinitely once reclaim retries are exhausted. The OOM path sees sufficient margin under the current limit and returns true without killing, while the writer still compares usage against its stale target and records another OOM event. Check the current limit at the start of each reclaim iteration and stop if it no longer matches the writer's target. Reproducer: Populate a cgroup with anonymous memory and disable swapping. Lower memory.max from one open file, then restore it to "max" through another open file after the new limit becomes visible. Without the patch, the first writer remains blocked and repeatedly increments the OOM event counter. With the patch, it returns normally. This was not motivated by a reported production workload. We found it through automated randomized testing for our cgroup observability work and reduced it to the reproducer above.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于并发更新memory.high或memory.max时，回收循环使用过时的写入者目标，可能导致写入者无限循环并错误记录OOM事件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f ~ ebf762a393630d1582645be3f0fc22a674eb9122 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-89752

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III. Intelligence Information for CVE-2026-89752

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Patches & Fixes for CVE-2026-89752 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89536 9.8 CRITICAL SUNRPC: wait for in-flight client TLS handshake callback
CVE-2026-89533 9.8 CRITICAL svcrdma: Fix offset arithmetic in read_chunk_range
CVE-2026-81002 9.8 CRITICAL xdp: fix zero-copy frame layout
CVE-2026-89643 9.8 CRITICAL audit: avoid dropping live tree ref on fsnotify rule autoremove
CVE-2026-89526 9.8 CRITICAL svcrdma: Validate Read chunk positions before reconstruction
CVE-2026-89652 9.8 CRITICAL ceph: bound copied dentry name length in NFS export get_name
CVE-2026-89651 9.8 CRITICAL ceph: bound MDSCapAuth path and fs_name decode in handle_session()
CVE-2026-89653 9.8 CRITICAL ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
CVE-2026-89654 9.8 CRITICAL ceph: fix UAF in check_new_map() on session freed during unlock
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89712 9.8 CRITICAL NFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89689 9.8 CRITICAL nfsd: don't free session slots that are still in use
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89752

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