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CVE-2026-31516— xfrm: prevent policy_hthresh.work from racing with netns teardown

CVSS 7.8 · High EPSS 0.01% · P2
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I. Basic Information for CVE-2026-31516

Vulnerability Information
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Vulnerability Title
xfrm: prevent policy_hthresh.work from racing with netns teardown
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: prevent policy_hthresh.work from racing with netns teardown A XFRM_MSG_NEWSPDINFO request can queue the per-net work item policy_hthresh.work onto the system workqueue. The queued callback, xfrm_hash_rebuild(), retrieves the enclosing struct net via container_of(). If the net namespace is torn down before that work runs, the associated struct net may already have been freed, and xfrm_hash_rebuild() may then dereference stale memory. xfrm_policy_fini() already flushes policy_hash_work during teardown, but it does not synchronize policy_hthresh.work. Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the queued work cannot outlive the net namespace teardown and access a freed struct net.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于policy_hthresh.work与网络命名空间拆卸竞争，可能导致访问已释放内存。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 880a6fab8f6ba5b5abe59ea68533202ddea1012c ~ 56ea2257b83ee29a543f158159e3d1abc1e3e4fe -
LinuxLinux 3.18 -

II. Public POCs for CVE-2026-31516

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III. Intelligence Information for CVE-2026-31516

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-314639.8 CRITICALiomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-314369.8 CRITICALdmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-314449.8 CRITICALksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-315019.8 CRITICALnet: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-314789.8 CRITICALksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-314489.4 CRITICALext4: avoid infinite loops caused by residual data
CVE-2026-314328.8 HIGHksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-314338.8 HIGHksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-314358.8 HIGHnetfs: Fix read abandonment during retry
CVE-2026-314508.8 HIGHext4: publish jinode after initialization
CVE-2026-314768.2 HIGHksmbd: do not expire session on binding failure
CVE-2026-314648.1 HIGHscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-315138.1 HIGHBluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-315027.8 HIGHteam: fix header_ops type confusion with non-Ethernet ports
CVE-2026-314907.8 HIGHdrm/xe/pf: Fix use-after-free in migration restore
CVE-2026-314947.8 HIGHnet: macb: use the current queue number for stats
CVE-2026-314497.8 HIGHext4: validate p_idx bounds in ext4_ext_correct_indexes
CVE-2026-314797.8 HIGHdrm/xe: always keep track of remap prev/next
CVE-2026-315047.8 HIGHnet: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-315057.8 HIGHiavf: fix out-of-bounds writes in iavf_get_ethtool_stats()

Showing top 20 of 100 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31516

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