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CVE-2026-31408— Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

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，该漏洞源于未在释放锁前持有套接字引用，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d57384e27d1ebf0047e3f00a6e1181b8be9857a2 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b0a7da0e3f7442545f071499beb36374714bb9de affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 108b81514d8f2535eb16651495cefb2250528db3 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e76e8f0581ef555eacc11dbb095e602fb30a5361 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 598dbba9919c5e36c54fe1709b557d64120cb94b affected
… +10 more rows
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I. Basic Information for CVE-2026-31408

Vulnerability Information
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Vulnerability Title
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/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，该漏洞源于未在释放锁前持有套接字引用，可能导致释放后重用。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-31408

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III. Intelligence Information for CVE-2026-31408

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Patches & Fixes for CVE-2026-31408 (2)

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-2026-31409 8.8 HIGH ksmbd: unset conn->binding on failed binding request
CVE-2026-31406 7.8 HIGH xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
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-2026-31408

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