Answer in brief
CVE-2026-53075 records a High severity (CVSS 8.8) vulnerability in ppp: require CAP_NET_ADMIN in target netns for unattached ioctls. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-53075 records a High severity (CVSS 8.8) vulnerability in ppp: require CAP_NET_ADMIN in target netns for unattached ioctls. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=273ec51dd7ceaa76e038875d85061ec856d8905e <c9edd90c57ae23692fff6b049fdfa4572a9fd532 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <5080e188c914110034bbc569d5cfa2f06204681d || >=273ec51dd7ceaa76e038875d85061ec856d8905e <67e901e28d177ac9a9bed76d69ce3471e704a89e || >=273ec51dd7ceaa76e038875d85061ec856d8905e <954745d0223e7caec917c0b2d1a889ff56fa6e54 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <3b2c2157dc2afc5c17cd7238afefca92f1ef330e || >=273ec51dd7ceaa76e038875d85061ec856d8905e <5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <1a8a51ce85075a56a743b6f142606dd2696a391c || >=273ec51dd7ceaa76e038875d85061ec856d8905e <2bb6379416fd19f44c3423a00bfd8626259f6067 | c9edd90c57ae23692fff6b049fdfa4572a9fd532, 5080e188c914110034bbc569d5cfa2f06204681d, 67e901e28d177ac9a9bed76d69ce3471e704a89e, 954745d0223e7caec917c0b2d1a889ff56fa6e54, 3b2c2157dc2afc5c17cd7238afefca92f1ef330e, 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8, 1a8a51ce85075a56a743b6f142606dd2696a391c, 2bb6379416fd19f44c3423a00bfd8626259f6067 |
| Linux/Linuxgeneric | 2.6.30 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=273ec51dd7ceaa76e038875d85061ec856d8905e <c9edd90c57ae23692fff6b049fdfa4572a9fd532 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <5080e188c914110034bbc569d5cfa2f06204681d || >=273ec51dd7ceaa76e038875d85061ec856d8905e <67e901e28d177ac9a9bed76d69ce3471e704a89e || >=273ec51dd7ceaa76e038875d85061ec856d8905e <954745d0223e7caec917c0b2d1a889ff56fa6e54 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <3b2c2157dc2afc5c17cd7238afefca92f1ef330e || >=273ec51dd7ceaa76e038875d85061ec856d8905e <5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 || >=273ec51dd7ceaa76e038875d85061ec856d8905e <1a8a51ce85075a56a743b6f142606dd2696a391c || >=273ec51dd7ceaa76e038875d85061ec856d8905e <2bb6379416fd19f44c3423a00bfd8626259f6067 | c9edd90c57ae23692fff6b049fdfa4572a9fd532, 5080e188c914110034bbc569d5cfa2f06204681d, 67e901e28d177ac9a9bed76d69ce3471e704a89e, 954745d0223e7caec917c0b2d1a889ff56fa6e54, 3b2c2157dc2afc5c17cd7238afefca92f1ef330e, 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8, 1a8a51ce85075a56a743b6f142606dd2696a391c, 2bb6379416fd19f44c3423a00bfd8626259f6067 |
| Linux/Linuxgeneric | 2.6.30 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
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.
Quoted source text, attributed separately from HOL analysis.