8.4

CVE-2026-63828

apparmor: mediate the implicit connect of TCP fast open sendmsg

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < a16714e7cf2baa98ba2efddd5d6cbac641f4e76b
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 20383429b56974507c465d016e5238b189f7a246
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 7f57428ce00891d26b0f087ef754a4d820ec83aa
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < faea60deaa05c76f0772650f42eafde12bd39d93
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 07b71c342382b854ab8030b244aeab6a7228ad7d
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 4a69b83045d3195d5b9a9b053ad840ddb2998b4e
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 45ebb934ea50b436ce49b2f159f090dab0d7fa28
Status affected
Version cf60af03ca4e71134206809ea892e49b92a88896
Version < 4d587cd8a72155089a627130bbd4716ec0856e21
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 3.6
Status affected
Version 0
Version < 3.6
Status unaffected
Version <= 5.10.*
Version 5.10.261
Status unaffected
Version <= 5.15.*
Version 5.15.212
Status unaffected
Version <= 6.1.*
Version 6.1.177
Status unaffected
Version <= 6.6.*
Version 6.6.144
Status unaffected
Version <= 6.12.*
Version 6.12.95
Status unaffected
Version <= 6.18.*
Version 6.18.38
Status unaffected
Version <= 7.1.*
Version 7.1.3
Status unaffected
Version <= *
Version 7.2
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.031
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 8.4 2 5.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/7f57428ce00891d26b0f087ef754a4d820ec83aa
https://git.kernel.org/stable/c/faea60deaa05c76f0772650f42eafde12bd39d93
https://git.kernel.org/stable/c/07b71c342382b854ab8030b244aeab6a7228ad7d
https://git.kernel.org/stable/c/4a69b83045d3195d5b9a9b053ad840ddb2998b4e
https://git.kernel.org/stable/c/45ebb934ea50b436ce49b2f159f090dab0d7fa28
https://git.kernel.org/stable/c/4d587cd8a72155089a627130bbd4716ec0856e21
https://git.kernel.org/stable/c/20383429b56974507c465d016e5238b189f7a246
https://git.kernel.org/stable/c/a16714e7cf2baa98ba2efddd5d6cbac641f4e76b