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CVE-2026-68432— vxlan: require CAP_NET_ADMIN in the device netns for changelink

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 4.11版本存在安全漏洞，该漏洞源于VXLAN设备changelink操作仅检查dev_net(dev)中的CAP_NET_ADMIN权限而未检查vxlan->net中的权限，可能导致具有dev_net权限但缺乏vxlan->net权限的调用者重写VXLAN设备配置。

CVSS 8.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8bcdc4f3a20be949df54b67e5ae2734daabb5792< b95a8743e58f7efed5ddc4cb73829b66f17feab0 affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< 7465ade989ba84adc2bfa58bad3ca25d249f0f7a affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< 0aa580a8bbbed2507b4582a1f0ef581d480d06ed affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< b3793d7dccb192ffff29894d11824db6251acdd5 affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< 730c7e5fea7f06e0cdf21c547222ec93234fd1d6 affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< e8ad0d311e225939a9a6c745d6cc384c7364ec87 affected
8bcdc4f3a20be949df54b67e5ae2734daabb5792< 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e affected
… +10 more rows
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I. Basic Information for CVE-2026-68432

Vulnerability Information
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Vulnerability Title
vxlan: require CAP_NET_ADMIN in the device netns for changelink
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns vxlan->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in vxlan->net can rewrite a vxlan device whose underlay lives in vxlan->net. vxlan_changelink() validates and applies the new configuration against vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the underlay socket in that netns, so the same reasoning as the tunnel changelink series applies here. Gate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 4.11版本存在安全漏洞，该漏洞源于VXLAN设备changelink操作仅检查dev_net(dev)中的CAP_NET_ADMIN权限而未检查vxlan->net中的权限，可能导致具有dev_net权限但缺乏vxlan->net权限的调用者重写VXLAN设备配置。
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 8bcdc4f3a20be949df54b67e5ae2734daabb5792 ~ b95a8743e58f7efed5ddc4cb73829b66f17feab0 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-68432

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III. Intelligence Information for CVE-2026-68432

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Patches & Fixes for CVE-2026-68432 (8)

Same Patch Batch · Linux · 2026-08-12 · 22 CVEs total

CVE-2026-68431 9.1 CRITICAL ksmbd: validate minimum PDU size for transform requests
CVE-2026-68433 8.6 HIGH libceph: bound get_version reply decode to front len
CVE-2026-68446 7.8 HIGH drm/vmwgfx: Validate vmw_surface_metadata::array_size
CVE-2026-68445 7.8 HIGH drm/vc4: Prevent shader BO mappings from becoming writable
CVE-2026-68440 7.8 HIGH net: txgbe: fix heap overflow when reading module EEPROM
CVE-2026-68442 7.8 HIGH btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
CVE-2026-68447 7.1 HIGH drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CVE-2026-68450 btrfs: free mapping node on duplicate reloc root insert
CVE-2026-68429 drm/dp_mst: Handle torn-down topology gracefully in drm_dp_mst_topology_queue_probe()
CVE-2026-68449 ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
CVE-2026-68448 ovl: check access to copy_file_range source with src mounter creds
CVE-2026-68444 firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
CVE-2026-68443 hwmon: (gigabyte_waterforce) Stop device IO before calling hid_hw_stop
CVE-2026-68441 net/sched: Handle TC_ACT_REDIRECT from qdisc filter chains
CVE-2026-68439 wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()
CVE-2026-68438 smp: Make CSD lock acquisition atomic for debug mode
CVE-2026-68437 drm/imagination: Fit paired fragment job in the correct CCCB
CVE-2026-68436 drm/amd/display: use kvzalloc to allocate struct dc
CVE-2026-68435 LoongArch: Fix address space mismatch in kexec command line lookup
CVE-2026-68434 serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68432

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