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CVE-2026-80880— IB/mlx5: Properly support implicit ODP rereg_mr

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IB/mlx5驱动对隐式ODP rereg_mr操作处理不当，子mkey在访问mr->pd时可能导致访问竞争条件。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1602 · Data from Configuration Repository

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ef3642c4f54d3493c92c71faf46139b2473bc532< cbc9982c8573fb9e35040063aa78c8ebe768a1ff affected
ef3642c4f54d3493c92c71faf46139b2473bc532< ee914ef54a7e707453ecb43eb30fb0a5c6dd0d69 affected
ef3642c4f54d3493c92c71faf46139b2473bc532< 94f7e50eb6b2ce7fbd9aeac1db22460d2013a3fb affected
ef3642c4f54d3493c92c71faf46139b2473bc532< eb7cb798e563b3f3b3baeb9cc6f7455764267e50 affected
ef3642c4f54d3493c92c71faf46139b2473bc532< d4f84bfa089fe71f775d25beb29303e844494c25 affected
ef3642c4f54d3493c92c71faf46139b2473bc532< 5d02b9a2efd11d28d2a8feac7769686b1b871d9c affected
ef3642c4f54d3493c92c71faf46139b2473bc532< ee7a8335069150c3f1893a697ab30bbeca00d796 affected
5.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-80880

Vulnerability Information
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Vulnerability Title
IB/mlx5: Properly support implicit ODP rereg_mr
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Properly support implicit ODP rereg_mr Due to all the child mkeys in the implicit ODP configuration we cannot change anything in place for the parent mkey. Instead the whole thing needs to be rebuilt if any change is requested. If the user does not specify a translation then force the implicit values which will then fall through the logic into mlx5_ib_reg_user_mr() to allocate a completely new MR. Since implicit children were also touching the mr->pd, this removes another case where the access was racy.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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IB/mlx5驱动对隐式ODP rereg_mr操作处理不当，子mkey在访问mr->pd时可能导致访问竞争条件。
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 ef3642c4f54d3493c92c71faf46139b2473bc532 ~ cbc9982c8573fb9e35040063aa78c8ebe768a1ff -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-80880

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III. Intelligence Information for CVE-2026-80880

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Patches & Fixes for CVE-2026-80880 (6)

Vendor Advisories for CVE-2026-80880 (1)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80880

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