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CVE-2026-53075— ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.30版本存在安全漏洞，该漏洞源于PPP设备对未关联ioctl的权限检查不足，可能导致本地非特权用户创建新的用户命名空间并滥用CAP_NET_ADMIN权限，从而对继承的网络命名空间执行未授权的PPP操作。

CVSS 8.8 · High EPSS 0.25% · P15

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 273ec51dd7ceaa76e038875d85061ec856d8905e< c9edd90c57ae23692fff6b049fdfa4572a9fd532 affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 5080e188c914110034bbc569d5cfa2f06204681d affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 67e901e28d177ac9a9bed76d69ce3471e704a89e affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 954745d0223e7caec917c0b2d1a889ff56fa6e54 affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 3b2c2157dc2afc5c17cd7238afefca92f1ef330e affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 1a8a51ce85075a56a743b6f142606dd2696a391c affected
273ec51dd7ceaa76e038875d85061ec856d8905e< 2bb6379416fd19f44c3423a00bfd8626259f6067 affected
… +10 more rows
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I. Basic Information for CVE-2026-53075

Vulnerability Information
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Vulnerability Title
ppp: require CAP_NET_ADMIN in target netns for unattached ioctls
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file->f_cred->user_ns, while unattached administrative ioctls operate on current->nsproxy->net_ns. As a result, a local unprivileged user can create a new user namespace with CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace, and still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against an inherited network namespace. Require CAP_NET_ADMIN in the user namespace that owns the target network namespace before handling unattached PPP administrative ioctls. This preserves normal pppd operation in the network namespace it is actually privileged in, while rejecting the userns-only inherited-netns case.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.30版本存在安全漏洞，该漏洞源于PPP设备对未关联ioctl的权限检查不足，可能导致本地非特权用户创建新的用户命名空间并滥用CAP_NET_ADMIN权限，从而对继承的网络命名空间执行未授权的PPP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 273ec51dd7ceaa76e038875d85061ec856d8905e ~ c9edd90c57ae23692fff6b049fdfa4572a9fd532 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-53075

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III. Intelligence Information for CVE-2026-53075

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Patches & Fixes for CVE-2026-53075 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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