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CVE-2026-31406— xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()

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，该漏洞源于取消工作后状态更新可能重新调度它，可能导致工作项在清理后执行。

CVSS 7.8 · High EPSS 0.16% · P6

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 32d0f44c2f14d60fe8e920e69a28c11051543ec1 affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 2255ed6adbc3100d2c4a83abd9d0396d04b87792 affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 21f2fc49ca6faa393c31da33b8a4e6c41fc84c13 affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< daf8e3b253aa760ff9e96c7768a464bc1d6b3c90 affected
6.11 affected
< 6.11 unaffected
6.12.80≤ 6.12.* unaffected
6.18.21≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-31406

Vulnerability Information
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Vulnerability Title
xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work. The following is a simple race scenario: cpu0 cpu1 cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list); cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于取消工作后状态更新可能重新调度它，可能导致工作项在清理后执行。
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 f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae ~ 32d0f44c2f14d60fe8e920e69a28c11051543ec1 -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-31406

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III. Intelligence Information for CVE-2026-31406

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Same Patch Batch · Linux · 2026-04-06 · 6 CVEs total

CVE-2026-31405 9.8 CRITICAL media: dvb-net: fix OOB access in ULE extension header tables
CVE-2026-31408 8.8 HIGH Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
CVE-2026-31409 8.8 HIGH ksmbd: unset conn->binding on failed binding request
CVE-2026-31407 7.1 HIGH netfilter: conntrack: add missing netlink policy validations
CVE-2026-31410 ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31406

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