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CVE-2026-68419— RDMA/irdma: Prevent rereg_mr for non-mem regions

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 6.7版本存在安全漏洞，该漏洞源于对非内存区域未阻止rereg_mr操作，可能导致用户应用程序触发mkey值为0的CQP操作。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25< fb46d134e1b8690bed2da9005b36d32d2efd34ac affected
5ac388db27c443dadfbb0b8b23fa7ccf429d901a< b5029e91c63406e4f4c8d58161048b41b6f0bd8c affected
5ac388db27c443dadfbb0b8b23fa7ccf429d901a< ca1c29f05274b737dc964e28b97803750d7cf7ec affected
5ac388db27c443dadfbb0b8b23fa7ccf429d901a< dbaa37e060918c45517786e37ecab0f300b48fa9 affected
5ac388db27c443dadfbb0b8b23fa7ccf429d901a< a846aecb931b4d65d5eafa92a0623545af46d4f2 affected
6.6.120< 6.6.148 affected
6.7 affected
< 6.7 unaffected
… +5 more rows
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I. Basic Information for CVE-2026-68419

Vulnerability Information
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Vulnerability Title
RDMA/irdma: Prevent rereg_mr for non-mem regions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent rereg_mr for non-mem regions When a QP/CQ/SRQ is created, a two step process is used where the buffer is allocated in userspace and explicitly registered with the normal reg_mr mechanism prior to creating the actual QP/CQ/SRQ object. These special registrations are indicated via an ABI field so the driver knows that they do not have a valid mkey and to skip the actual CQP command submission. Since these are real MR objects from the core's perspective, it is possible for a user application to invoke rereg_mr on them and cause a real CQP op to be emitted with the zero-initialized mkey value of 0. Fix this by preventing rereg_mr on these special regions.
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基金会开源的一个操作系统内核。 Linux kernel 6.7版本存在安全漏洞，该漏洞源于对非内存区域未阻止rereg_mr操作，可能导致用户应用程序触发mkey值为0的CQP操作。
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 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 ~ fb46d134e1b8690bed2da9005b36d32d2efd34ac -
Linux Linux 6.7 -

II. Public POCs for CVE-2026-68419

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III. Intelligence Information for CVE-2026-68419

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Patches & Fixes for CVE-2026-68419 (5)

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

CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
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-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
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-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
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-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
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-2026-68124 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-2026-68419

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