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CVE-2026-68140— net/iucv: fix use-after-free of a severed iucv_path

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于af_iucv队列中未接收的消息通知持有已释放的iucv_path指针，导致释放后重用。

CVSS 8.8 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f0703c80e5156406ad947cb67fe277725b48080f< 5f08c5e50bcb4680069bd3f9edd5728308816ded affected
f0703c80e5156406ad947cb67fe277725b48080f< c24faf11bd31bfe0500aca12cbdd5a573a954a5d affected
f0703c80e5156406ad947cb67fe277725b48080f< 99ddb33748698296a6f17b9b34aa3d16a406bb3c affected
f0703c80e5156406ad947cb67fe277725b48080f< 23658b350b4107e8292045c2044983fd426fa15d affected
f0703c80e5156406ad947cb67fe277725b48080f< a5bbaddf69853117f28173c3f5c8fc14c6b2ec82 affected
f0703c80e5156406ad947cb67fe277725b48080f< 900cd6d8119b7f3ae5c4bf82f922ff5957df43db affected
f0703c80e5156406ad947cb67fe277725b48080f< f579582c03ed526281a8450159baf1d35099a85f affected
f0703c80e5156406ad947cb67fe277725b48080f< be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a affected
… +10 more rows
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I. Basic Information for CVE-2026-68140

Vulnerability Information
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Vulnerability Title
net/iucv: fix use-after-free of a severed iucv_path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use-after-free of a severed iucv_path af_iucv queues not-yet-received message notifications on iucv->message_q, each holding a raw pointer to the connection's iucv_path. When the peer severs the connection, iucv_sever_path() frees that path with iucv_path_free() but leaves the notifications queued. A later recvmsg() drains message_q via iucv_process_message_q() and hands the stale path to message_receive() -- a use-after-free of the freed iucv_path. Drop the queued notifications when the path is severed; once the path is gone they can no longer be received. This also frees the notifications leaked when a socket is closed with messages still queued.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于af_iucv队列中未接收的消息通知持有已释放的iucv_path指针，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 f0703c80e5156406ad947cb67fe277725b48080f ~ 5f08c5e50bcb4680069bd3f9edd5728308816ded -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-68140

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III. Intelligence Information for CVE-2026-68140

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Patches & Fixes for CVE-2026-68140 (7)

Other References for CVE-2026-68140 (1)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68140

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