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CVE-2026-64531— net: openvswitch: reject oversized nested action attrs

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基金会开源的一款操作系统内核。 Linux kernel 5.15.180至5.15.212之前版本、6.1.132至6.1.178之前版本、6.6.84至6.6.145之前版本、6.12.20至6.12.97之前版本、6.13.8至6.14之前版本和6.14版本存在安全漏洞，该漏洞源于对nla_len的验证不足，导致生成的嵌套操作属性大小超过U16_MAX时被截断，可能被解释为独立操作。

CVSS 7.8 · High EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 057dbc5b72e9fcac439cd561c3a539b8a0edeb92< ab855641241387db062a5e41d9ad6b8561542572 affected
2532adbfe917c0e71dba2650ffc6efe396314c87< c66bd2626c2764f23764ff0f8277f44a9cfe8349 affected
4b1a0ee6164c7204c68ab5a9c48c07bfe8852485< d573250d228401f707f4dbc09d11227a6215ee5f affected
e6610f9c08b4c04cf7949c10fc246c071d00e935< f1efff8858403191361a01269c6fe8dd7f55a385 affected
a1e64addf3ff9257b45b78bc7d743781c3f41340< dbd14f736be02cfe73049bd801af89becd1a0749 affected
a1e64addf3ff9257b45b78bc7d743781c3f41340< 1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe affected
a1e64addf3ff9257b45b78bc7d743781c3f41340< 3f1f755366687d051174739fb99f7d560202f60b affected
6b099d285d7ed324494b6d684f377aa103856118 affected
… +14 more rows
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I. Basic Information for CVE-2026-64531

Vulnerability Information
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Vulnerability Title
net: openvswitch: reject oversized nested action attrs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reject oversized nested action attrs Open vSwitch stores generated flow actions as nlattrs, whose nla_len field is u16. Commit a1e64addf3ff ("net: openvswitch: remove misbehaving actions length check") allowed the total sw_flow_actions stream to grow beyond 64 KiB, which is valid, but also removed the last guard preventing a generated nested action attribute from exceeding U16_MAX. An oversized generated container can thus be closed with a truncated nla_len. A later dump or teardown then walks a structurally different stream than the one that was validated. In particular, an oversized nested CLONE/CT action may cause subsequent bytes in the generated stream to be interpreted as independent actions. Keep the larger total-action-stream behavior, but make nested action close reject generated containers that do not fit in nla_len, and return the error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and CHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse construction order before discarding failed wrappers, so resources copied into the rejected tails are released before the wrappers are removed. Most failed outer wrappers are discarded by truncating actions_len after child resources have been released. CHECK_PKT_LEN also trims its parent after branch resources are gone. SET/TUNNEL close failures unwind their known tun_dst ownership directly, and SET_TO_MASKED has no external ownership and truncates on close failure.
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基金会开源的一款操作系统内核。 Linux kernel 5.15.180至5.15.212之前版本、6.1.132至6.1.178之前版本、6.6.84至6.6.145之前版本、6.12.20至6.12.97之前版本、6.13.8至6.14之前版本和6.14版本存在安全漏洞，该漏洞源于对nla_len的验证不足，导致生成的嵌套操作属性大小超过U16_MAX时被截断，可能被解释为独立操作。
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 057dbc5b72e9fcac439cd561c3a539b8a0edeb92 ~ ab855641241387db062a5e41d9ad6b8561542572 -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-64531

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III. Intelligence Information for CVE-2026-64531

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Patches & Fixes for CVE-2026-64531 (7)

Same Patch Batch · Linux · 2026-07-27 · 26 CVEs total

CVE-2026-64534 9.8 CRITICAL nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64535 9.8 CRITICAL nvmet-tcp: Fix potential UAF when ddgst mismatch
CVE-2026-64541 9.8 CRITICAL net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket
CVE-2026-64551 9.1 CRITICAL sctp: validate STALE_COOKIE cause length before reading staleness
CVE-2026-64555 8.8 HIGH KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
CVE-2026-64554 8.8 HIGH netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
CVE-2026-64552 8.4 HIGH virtio-net: fix len check in receive_big()
CVE-2026-64548 8.4 HIGH bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
CVE-2026-64540 8.1 HIGH usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()
CVE-2026-64536 8.1 HIGH staging: rtl8723bs: fix OOB reads in is_ap_in_tkip() IE loop
CVE-2026-64547 8.1 HIGH net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
CVE-2026-64539 7.8 HIGH Bluetooth: eir: Fix stack OOB write when prepending the Flags AD
CVE-2026-64532 7.8 HIGH fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
CVE-2026-64533 7.8 HIGH fs/ntfs3: validate lcns_follow in log_replay conversion
CVE-2026-64543 7.8 HIGH tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
CVE-2026-17523 7.8 HIGH can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
CVE-2026-64545 7.5 HIGH net, bpf: check master for NULL in xdp_master_redirect()
CVE-2026-64550 7.3 HIGH net: qualcomm: rmnet: validate MAP frame length before ingress parsing
CVE-2026-64546 7.1 HIGH drm/edid: fix OOB read in drm_parse_tiled_block()
CVE-2026-64544 crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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