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CVE-2026-52923 is an expired-pointer dereference vulnerability in the Linux kernel SysV IPC checkpoint/restore allocation path. The ipc_idr_alloc() function passed a requested next IPC identifier to the IDR allocator with an unbounded upper limit. When the valid SysV IPC identifier range was exhausted, allocation could occur beyond ipc_mni. The resulting object identifier retained a narrower index encoding, causing subsequent lookup or removal to truncate the actual IDR index and address an incorrect in-range slot. For shared-memory objects, destruction could free the object while leaving its out-of-range IDR entry as a dangling pointer; subsequent enumeration of SysV shared-memory objects could dereference the freed object. The fix bounds allocation to ipc_mni and fails the checkpoint/restore request when the valid range is exhausted.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel IPC vulnerability involving next_id allocation outside the valid ID range, fixed by the SUSE kernel update.
A Linux kernel IPC vulnerability addressed in this Red Hat kernel security advisory.
A Linux kernel use-after-free vulnerability in SysV IPC checkpoint/restore ID allocation caused by ipc_idr_alloc() not properly limiting ID allocation to the valid range, potentially leading to local denial of service and information disclosure.
A Linux kernel IPC vulnerability related to next_id allocation outside the valid ID range.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.