NULL Pointer Dereference Affecting kernel-rt-debug package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTDEBUG-7524130
- published 17 Jul 2024
- disclosed 12 Jul 2024
Introduced: 12 Jul 2024
CVE-2024-39506 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt-debug.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
liquidio: Adjust a NULL pointer handling path in lio_vf_rep_copy_packet
In lio_vf_rep_copy_packet() pg_info->page is compared to a NULL value, but then it is unconditionally passed to skb_add_rx_frag() which looks strange and could lead to null pointer dereference.
lio_vf_rep_copy_packet() call trace looks like: octeon_droq_process_packets octeon_droq_fast_process_packets octeon_droq_dispatch_pkt octeon_create_recv_info ...search in the dispatch_list... ->disp_fn(rdisp->rinfo, ...) lio_vf_rep_pkt_recv(struct octeon_recv_info *recv_info, ...) In this path there is no code which sets pg_info->page to NULL. So this check looks unneeded and doesn't solve potential problem. But I guess the author had reason to add a check and I have no such card and can't do real test. In addition, the code in the function liquidio_push_packet() in liquidio/lio_core.c does exactly the same.
Based on this, I consider the most acceptable compromise solution to adjust this issue by moving skb_add_rx_frag() into conditional scope.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
References
- https://access.redhat.com/security/cve/CVE-2024-39506
- https://git.kernel.org/stable/c/87d6bdc006f0cbf297a3b2ad6e40ede4c3ee5dc2
- https://git.kernel.org/stable/c/a6f4d0ec170a46b5f453cacf55dff5989b42bbfa
- https://git.kernel.org/stable/c/a86490a3712cc513113440a606a0e77130abd47c
- https://git.kernel.org/stable/c/c44711b78608c98a3e6b49ce91678cd0917d5349
- https://git.kernel.org/stable/c/cbf18d8128a753cb632bef39470d19befd9c7347
- https://git.kernel.org/stable/c/dcc7440f32c7a26b067aff6e7d931ec593024a79
- https://git.kernel.org/stable/c/f1ab15a09492a5ae8ab1e2c35ba2cf9e150d25ee
- https://git.kernel.org/stable/c/fd2b613bc4c508e55c1221c6595bb889812a4fea