7.8

CVE-2021-33034

Exploit
In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.4.269
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.269
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.233
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.191
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.119
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.37
Linux ≫ Linux Kernel Version >= 5.11 < 5.11.21
Linux ≫ Linux Kernel Version >= 5.12 < 5.12.4
Fedoraproject ≫ Fedora Version 34
Debian ≫ Debian Linux Version 9.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.82% 0.527
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NIST 4.6 3.9 6.4
AV:L/AC:L/Au:N/C:P/I:P/A:P
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3
Patch
Vendor Advisory
Mailing List
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl
Third Party Advisory
Exploit
https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1
Third Party Advisory
Exploit
Mailing List
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
Patch
Vendor Advisory
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GI7Z7UBWBGD3ABNIL2DC7RQDCGA4UVQW/
Broken Link