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CVE-2026-52930— ipc/shm: serialize orphan cleanup with shm_nattch updates

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 3.1版本存在安全漏洞，该漏洞源于孤儿清理操作与shm_nattch更新未正确序列化，可能导致并发问题。

AI Predicted 4.7 Difficulty: Hard EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064 affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< 1f0d01e35dbb228084d5187212e32c91a30dcbeb affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< 6560be3f6a5bb84f006f184f0c966747bb58e1a3 affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< b5107b4ce3ad45fcf369ee2058c8910620f4b5a8 affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< db752ebfdaf2c7f27cd9690ef48b616af068319c affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< 030bbc857bd51d4b25a90d931d3f8775ef22823a affected
4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d< 2e5c6f4fd4001562781e99bbfc7f1f0127187542 affected
… +10 more rows
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I. Basic Information for CVE-2026-52930

Vulnerability Information
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Vulnerability Title
ipc/shm: serialize orphan cleanup with shm_nattch updates
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 3.1版本存在安全漏洞，该漏洞源于孤儿清理操作与shm_nattch更新未正确序列化，可能导致并发问题。
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 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d ~ b1e9aef48e4d8a0c1b54fb913077b0824ed7d650 -
Linux Linux 3.1 -

II. Public POCs for CVE-2026-52930

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-52930

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Patches & Fixes for CVE-2026-52930 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52930

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