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CVE-2026-68425— IB/mad: Drop unmatched RMPP responses before reassembly

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RMPP响应处理顺序不当，在匹配发送之前即启动重组，可能导致未匹配的响应分配或扩展RMPP接收状态。

CVSS 7.1 · High EPSS 0.26% · P17

Possible ATT&CK Techniques 2 AI

T1043 T1498 · Network Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fa619a77046bef30478697aba0553991033afb8e< 45416c87ebcece1e90f3bc5bc172d106b77c6b69 affected
fa619a77046bef30478697aba0553991033afb8e< 9634fb1f4d404f36a20ffbcb8797369db69b06bb affected
fa619a77046bef30478697aba0553991033afb8e< bfb9e8243fd2099d1080d09222964d988f991d9b affected
fa619a77046bef30478697aba0553991033afb8e< dfa535c94406c03d3f0c869ef3ba5528e395737c affected
fa619a77046bef30478697aba0553991033afb8e< 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72 affected
fa619a77046bef30478697aba0553991033afb8e< 98d2d468b4faa1fdc68c0c6c238389906ee3490c affected
fa619a77046bef30478697aba0553991033afb8e< ad9c9ad3204f63a46f0f7de29687a8e512f05e29 affected
fa619a77046bef30478697aba0553991033afb8e< d2e52d610b9b09694261632340b801a421e0b0c5 affected
… +10 more rows
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I. Basic Information for CVE-2026-68425

Vulnerability Information
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Vulnerability Title
IB/mad: Drop unmatched RMPP responses before reassembly
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: IB/mad: Drop unmatched RMPP responses before reassembly Kernel-handled RMPP receive processing starts reassembly for active DATA responses before the response is matched to an outstanding send. The normal match happens later, after ib_process_rmpp_recv_wc() has either assembled a complete message or consumed the segment. That ordering lets an unsolicited response that routes to a kernel RMPP agent by the high TID bits allocate or extend RMPP receive state before the full TID and source address are checked against a real request. A reordered burst can therefore reach the receive-side insertion path even though the response would not match any send. For kernel-handled RMPP DATA responses, require the existing ib_find_send_mad() match before entering RMPP reassembly. The matcher already checks the full TID, management class and source address/GID against the agent wait, backlog and in-flight send lists. If there is no match, drop the response without creating RMPP state. This leaves the RMPP window behavior unchanged and only rejects responses that have no corresponding request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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RMPP响应处理顺序不当，在匹配发送之前即启动重组，可能导致未匹配的响应分配或扩展RMPP接收状态。
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 fa619a77046bef30478697aba0553991033afb8e ~ 45416c87ebcece1e90f3bc5bc172d106b77c6b69 -
Linux Linux 2.6.13 -

II. Public POCs for CVE-2026-68425

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III. Intelligence Information for CVE-2026-68425

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Patches & Fixes for CVE-2026-68425 (8)

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

CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
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-2026-68425

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