Answer in brief
CVE-2026-52930 records a Medium severity (CVSS 5.5) vulnerability in ipc/shm: serialize orphan cleanup with shm_nattch updates. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <1f0d01e35dbb228084d5187212e32c91a30dcbeb || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <6560be3f6a5bb84f006f184f0c966747bb58e1a3 || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <db752ebfdaf2c7f27cd9690ef48b616af068319c || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <030bbc857bd51d4b25a90d931d3f8775ef22823a || >=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <2e5c6f4fd4001562781e99bbfc7f1f0127187542 | b1e9aef48e4d8a0c1b54fb913077b0824ed7d650, 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064, 1f0d01e35dbb228084d5187212e32c91a30dcbeb, 6560be3f6a5bb84f006f184f0c966747bb58e1a3, b5107b4ce3ad45fcf369ee2058c8910620f4b5a8, db752ebfdaf2c7f27cd9690ef48b616af068319c, 030bbc857bd51d4b25a90d931d3f8775ef22823a, 2e5c6f4fd4001562781e99bbfc7f1f0127187542 |
| Linux/Linuxgeneric | 3.1 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
In the Linux kernel, the following vulnerability has been resolved: ipc/shm: serialize orphan cleanup with shm_nattch updates shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that does not serialize all fields tested by shm_may_destroy(). In particular, shm_nattch is updated while holding shm_perm.lock, and attach paths can do that without holding the rwsem. Do not decide that an orphaned segment is unused before taking the object lock. Move the shm_may_destroy() check under shm_perm.lock, matching the other destroy paths, and unlock the segment when it no longer qualifies for removal.
Quoted source text, attributed separately from HOL analysis.