Answer in brief
CVE-2026-63829 records a Unknown severity vulnerability in net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink. 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-2026-63829 records a Unknown severity vulnerability in net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink. 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.
A CVSS score is not reported in the current record. 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 | >=b57708add31494175be741ed3fd24023b50c3423 <19275943d8fe903eb7b9aa53e380e41efd042ada || >=b57708add31494175be741ed3fd24023b50c3423 <866b0f5ae599490bd496fd84581c68ac8b94e6af || >=b57708add31494175be741ed3fd24023b50c3423 <92b766fc55156e0da2ecd0c2302c971118f8a229 || >=b57708add31494175be741ed3fd24023b50c3423 <e54c05ed3d9c28733fb9e5837219aca3691defa3 || >=b57708add31494175be741ed3fd24023b50c3423 <9831bc9ecb402957810c2045c663fbfe9b09e296 || >=b57708add31494175be741ed3fd24023b50c3423 <1697957eb0971d420dde42862b88eb43506a1105 || >=b57708add31494175be741ed3fd24023b50c3423 <47b5d3d506609b08b2e1f7c14f0b681a1953d572 || >=b57708add31494175be741ed3fd24023b50c3423 <8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 | 19275943d8fe903eb7b9aa53e380e41efd042ada, 866b0f5ae599490bd496fd84581c68ac8b94e6af, 92b766fc55156e0da2ecd0c2302c971118f8a229, e54c05ed3d9c28733fb9e5837219aca3691defa3, 9831bc9ecb402957810c2045c663fbfe9b09e296, 1697957eb0971d420dde42862b88eb43506a1105, 47b5d3d506609b08b2e1f7c14f0b681a1953d572, 8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 |
| Linux/Linuxgeneric | 3.16 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->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 t->net can rewrite a tunnel that lives in t->net. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It requires CAP_NET_ADMIN in the link netns and is skipped when the link netns is dev_net(dev), where the rtnl path already checked it. The other patches in this series use the same helper. Gate ipgre_changelink() and erspan_changelink() with it, at the top of the op before any attribute is parsed, because the parsers update live tunnel fields first. ipgre_netlink_parms() sets t->collect_md before ip_tunnel_changelink() runs. Commit 8b484efd5cb4 ("ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate().") added the same check on the ioctl path. This adds it on RTM_NEWLINK.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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 | >=b57708add31494175be741ed3fd24023b50c3423 <19275943d8fe903eb7b9aa53e380e41efd042ada || >=b57708add31494175be741ed3fd24023b50c3423 <866b0f5ae599490bd496fd84581c68ac8b94e6af || >=b57708add31494175be741ed3fd24023b50c3423 <92b766fc55156e0da2ecd0c2302c971118f8a229 || >=b57708add31494175be741ed3fd24023b50c3423 <e54c05ed3d9c28733fb9e5837219aca3691defa3 || >=b57708add31494175be741ed3fd24023b50c3423 <9831bc9ecb402957810c2045c663fbfe9b09e296 || >=b57708add31494175be741ed3fd24023b50c3423 <1697957eb0971d420dde42862b88eb43506a1105 || >=b57708add31494175be741ed3fd24023b50c3423 <47b5d3d506609b08b2e1f7c14f0b681a1953d572 || >=b57708add31494175be741ed3fd24023b50c3423 <8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 | 19275943d8fe903eb7b9aa53e380e41efd042ada, 866b0f5ae599490bd496fd84581c68ac8b94e6af, 92b766fc55156e0da2ecd0c2302c971118f8a229, e54c05ed3d9c28733fb9e5837219aca3691defa3, 9831bc9ecb402957810c2045c663fbfe9b09e296, 1697957eb0971d420dde42862b88eb43506a1105, 47b5d3d506609b08b2e1f7c14f0b681a1953d572, 8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 |
| Linux/Linuxgeneric | 3.16 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->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 t->net can rewrite a tunnel that lives in t->net. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It requires CAP_NET_ADMIN in the link netns and is skipped when the link netns is dev_net(dev), where the rtnl path already checked it. The other patches in this series use the same helper. Gate ipgre_changelink() and erspan_changelink() with it, at the top of the op before any attribute is parsed, because the parsers update live tunnel fields first. ipgre_netlink_parms() sets t->collect_md before ip_tunnel_changelink() runs. Commit 8b484efd5cb4 ("ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate().") added the same check on the ioctl path. This adds it on RTM_NEWLINK.
Quoted source text, attributed separately from HOL analysis.