Answer in brief
CVE-2026-63828 records a Unknown severity vulnerability in apparmor: mediate the implicit connect of TCP fast open sendmsg. 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-2026-63828 records a Unknown severity vulnerability in apparmor: mediate the implicit connect of TCP fast open sendmsg. 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 | >=cf60af03ca4e71134206809ea892e49b92a88896 <a16714e7cf2baa98ba2efddd5d6cbac641f4e76b || >=cf60af03ca4e71134206809ea892e49b92a88896 <20383429b56974507c465d016e5238b189f7a246 || >=cf60af03ca4e71134206809ea892e49b92a88896 <7f57428ce00891d26b0f087ef754a4d820ec83aa || >=cf60af03ca4e71134206809ea892e49b92a88896 <faea60deaa05c76f0772650f42eafde12bd39d93 || >=cf60af03ca4e71134206809ea892e49b92a88896 <07b71c342382b854ab8030b244aeab6a7228ad7d || >=cf60af03ca4e71134206809ea892e49b92a88896 <4a69b83045d3195d5b9a9b053ad840ddb2998b4e || >=cf60af03ca4e71134206809ea892e49b92a88896 <45ebb934ea50b436ce49b2f159f090dab0d7fa28 || >=cf60af03ca4e71134206809ea892e49b92a88896 <4d587cd8a72155089a627130bbd4716ec0856e21 | a16714e7cf2baa98ba2efddd5d6cbac641f4e76b, 20383429b56974507c465d016e5238b189f7a246, 7f57428ce00891d26b0f087ef754a4d820ec83aa, faea60deaa05c76f0772650f42eafde12bd39d93, 07b71c342382b854ab8030b244aeab6a7228ad7d, 4a69b83045d3195d5b9a9b053ad840ddb2998b4e, 45ebb934ea50b436ce49b2f159f090dab0d7fa28, 4d587cd8a72155089a627130bbd4716ec0856e21 |
| Linux/Linuxgeneric | 3.6 | 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: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection in the SYN. apparmor_socket_sendmsg() only checks AA_MAY_SEND, so a profile that grants send but denies connect lets a confined task open an outbound TCP/MPTCP connection that connect(2) would have refused, bypassing connect mediation. Mediate the implicit connect when MSG_FASTOPEN is set and a destination is supplied. Add it to apparmor_socket_sendmsg() (not the shared aa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm() directly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not cover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit.
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 | >=cf60af03ca4e71134206809ea892e49b92a88896 <a16714e7cf2baa98ba2efddd5d6cbac641f4e76b || >=cf60af03ca4e71134206809ea892e49b92a88896 <20383429b56974507c465d016e5238b189f7a246 || >=cf60af03ca4e71134206809ea892e49b92a88896 <7f57428ce00891d26b0f087ef754a4d820ec83aa || >=cf60af03ca4e71134206809ea892e49b92a88896 <faea60deaa05c76f0772650f42eafde12bd39d93 || >=cf60af03ca4e71134206809ea892e49b92a88896 <07b71c342382b854ab8030b244aeab6a7228ad7d || >=cf60af03ca4e71134206809ea892e49b92a88896 <4a69b83045d3195d5b9a9b053ad840ddb2998b4e || >=cf60af03ca4e71134206809ea892e49b92a88896 <45ebb934ea50b436ce49b2f159f090dab0d7fa28 || >=cf60af03ca4e71134206809ea892e49b92a88896 <4d587cd8a72155089a627130bbd4716ec0856e21 | a16714e7cf2baa98ba2efddd5d6cbac641f4e76b, 20383429b56974507c465d016e5238b189f7a246, 7f57428ce00891d26b0f087ef754a4d820ec83aa, faea60deaa05c76f0772650f42eafde12bd39d93, 07b71c342382b854ab8030b244aeab6a7228ad7d, 4a69b83045d3195d5b9a9b053ad840ddb2998b4e, 45ebb934ea50b436ce49b2f159f090dab0d7fa28, 4d587cd8a72155089a627130bbd4716ec0856e21 |
| Linux/Linuxgeneric | 3.6 | 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: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection in the SYN. apparmor_socket_sendmsg() only checks AA_MAY_SEND, so a profile that grants send but denies connect lets a confined task open an outbound TCP/MPTCP connection that connect(2) would have refused, bypassing connect mediation. Mediate the implicit connect when MSG_FASTOPEN is set and a destination is supplied. Add it to apparmor_socket_sendmsg() (not the shared aa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm() directly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not cover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit.
Quoted source text, attributed separately from HOL analysis.