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CVE-2026-74566— keys: make keyring key-chunk byte order agree with keyring_diff_objects()

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keyring的key-chunk字节序与keyring_diff_objects()不一致，导致精心构造的描述可能碰撞到同一节点。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1553 · Subvert Trust Controls

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f771fde82051976a6fc0fd570f8b86de4a92124b< 414bcf37d81ce9b3823aabc06b04c97fdcbe489b affected
f771fde82051976a6fc0fd570f8b86de4a92124b< abe43c661efb753d5ee35ad8ace4bbb16fa9afd0 affected
f771fde82051976a6fc0fd570f8b86de4a92124b< f81920917074e3c4ad4fba06fe8c56738d010606 affected
f771fde82051976a6fc0fd570f8b86de4a92124b< bd0f976ef89dce6db458bf75bc2cf51127becc41 affected
f771fde82051976a6fc0fd570f8b86de4a92124b< 7269df3e7fcfa308e6a456305162f7788747bdbd affected
f771fde82051976a6fc0fd570f8b86de4a92124b< 3d9f16c0b643ceac305526b2e2fe25c2c6166926 affected
f771fde82051976a6fc0fd570f8b86de4a92124b< 7e5397a3fed0dee7779bd084bec3c0584db3c930 affected
f771fde82051976a6fc0fd570f8b86de4a92124b< 58565eef0f8d861aae92abfb7658458d661cee17 affected
… +10 more rows
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I. Basic Information for CVE-2026-74566

Vulnerability Information
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Vulnerability Title
keys: make keyring key-chunk byte order agree with keyring_diff_objects()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: keys: make keyring key-chunk byte order agree with keyring_diff_objects() keyring_get_key_chunk() loads description bytes into the index chunk low address first, while keyring_diff_objects() numbers the first differing bit from the low end and folds the absolute byte index into the level without removing the inline-prefix offset the level already carries. The two disagree on byte order and bit position, so the array can be told two keys first differ at a bit that does not differ in the chunk the walker uses, letting crafted descriptions collide into one node. Load the chunk in the order keyring_diff_objects() assumes and drop the inline-prefix length when folding the byte index into the level. This only changes the in-memory ordering used to place keys within a keyring; add, search and read of non-colliding keys are unaffected.
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keyring的key-chunk字节序与keyring_diff_objects()不一致，导致精心构造的描述可能碰撞到同一节点。
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 f771fde82051976a6fc0fd570f8b86de4a92124b ~ 414bcf37d81ce9b3823aabc06b04c97fdcbe489b -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-74566

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III. Intelligence Information for CVE-2026-74566

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Patches & Fixes for CVE-2026-74566 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
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-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74268 9.8 CRITICAL tcp: clear sock_ops cb flags before force-closing a child socket
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74566

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