7.8

CVE-2023-53619

netfilter: conntrack: Avoid nf_ct_helper_hash uses after free

In the Linux kernel, the following vulnerability has been resolved:

netfilter: conntrack: Avoid nf_ct_helper_hash uses after free

If nf_conntrack_init_start() fails (for example due to a
register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()
clean-up path frees the nf_ct_helper_hash map.

When built with NF_CONNTRACK=y, further netfilter modules (e.g:
netfilter_conntrack_ftp) can still be loaded and call
nf_conntrack_helpers_register(), independently of whether nf_conntrack
initialized correctly. This accesses the nf_ct_helper_hash dangling
pointer and causes a uaf, possibly leading to random memory corruption.

This patch guards nf_conntrack_helper_register() from accessing a freed
or uninitialized nf_ct_helper_hash pointer and fixes possible
uses-after-free when loading a conntrack module.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.6 < 4.14.322
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.291
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.251
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.188
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.121
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.39
Linux ≫ Linux Kernel Version >= 6.2 < 6.4.4
Linux ≫ Linux Kernel Version6.5 Updaterc1
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.2% 0.102
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 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
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7
Patch
https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0
Patch
https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9
Patch
https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175
Patch
https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566
Patch
https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034
Patch
https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7
Patch
https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b
Patch