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CVE-2026-74282— tipc: prevent snt_unacked underflow on CONN_ACK

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 4.7版本存在安全漏洞，该漏洞源于tipc_sk_conn_proto_rcv()函数处理CONN_ACK消息时未检查连接确认计数是否超过未完成消息数，导致snt_unacked下溢，可能造成连接发送阻塞，攻击者可通过发送过大的连接确认消息导致TIPC连接发送端阻塞。

CVSS 7.5 · High EPSS 0.68% · P50

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 10724cc7bb7832b482df049c20fd824d928c5eaa< 3388145d258cf2c4c98278e3987296007d30672e affected
10724cc7bb7832b482df049c20fd824d928c5eaa< 67e55b054bf8025658dc0e255057f2a6236416bd affected
10724cc7bb7832b482df049c20fd824d928c5eaa< 96f91b8ae1a489b3eca137e7acf42cf985fb8939 affected
10724cc7bb7832b482df049c20fd824d928c5eaa< 47ed873e4ceda34098bd46d8e96b4bb13cad3a04 affected
10724cc7bb7832b482df049c20fd824d928c5eaa< b44bebdd32c9ff66ee2aebfc317ced44bedd9335 affected
10724cc7bb7832b482df049c20fd824d928c5eaa< 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e affected
10724cc7bb7832b482df049c20fd824d928c5eaa< 1e2c956745777e6ffdee7f30da5935741c03ee1e affected
10724cc7bb7832b482df049c20fd824d928c5eaa< ab3e10b44ba5411779aac7afd2477917dd77750f affected
… +10 more rows
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I. Basic Information for CVE-2026-74282

Vulnerability Information
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Vulnerability Title
tipc: prevent snt_unacked underflow on CONN_ACK
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked underflow on CONN_ACK tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages actually outstanding: tsk->snt_unacked -= msg_conn_ack(hdr); msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK message. If the ack count is larger than snt_unacked, the subtraction wraps to a near-maximum value, leaving tsk_conn_cong() permanently true and starving the connection of further transmits. Validate the ACK count at the start of the CONN_ACK block and drop the message if it acknowledges more messages than are outstanding. A peer (or, for a local connection, the connected peer socket) can otherwise wedge a TIPC connection's send side by sending an oversized connection ack.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 4.7版本存在安全漏洞，该漏洞源于tipc_sk_conn_proto_rcv()函数处理CONN_ACK消息时未检查连接确认计数是否超过未完成消息数，导致snt_unacked下溢，可能造成连接发送阻塞，攻击者可通过发送过大的连接确认消息导致TIPC连接发送端阻塞。
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 10724cc7bb7832b482df049c20fd824d928c5eaa ~ 3388145d258cf2c4c98278e3987296007d30672e -
Linux Linux 4.7 -

II. Public POCs for CVE-2026-74282

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III. Intelligence Information for CVE-2026-74282

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Patches & Fixes for CVE-2026-74282 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74350 9.8 CRITICAL ocfs2: validate fast symlink target during inode read
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72494 9.8 CRITICAL RDMA/irdma: Replace waitqueue and flag with completion
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-72098 9.8 CRITICAL dm-verity: fix buffer overflow in FEC calculation
CVE-2026-72226 9.8 CRITICAL batman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-74428 9.8 CRITICAL rxrpc: Fix double unlock in rxrpc_recvmsg()
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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