CVE-2024-49948 Affecting kernel-debug-core package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGCORE-8287535
- published 23 Oct 2024
- disclosed 21 Oct 2024
Introduced: 21 Oct 2024
CVE-2024-49948 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8 kernel-debug-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-core package and not the kernel-debug-core package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: add more sanity checks to qdisc_pkt_len_init()
One path takes care of SKB_GSO_DODGY, assuming skb->len is bigger than hdr_len.
virtio_net_hdr_to_skb() does not fully dissect TCP headers, it only make sure it is at least 20 bytes.
It is possible for an user to provide a malicious 'GSO' packet, total length of 80 bytes.
- 20 bytes of IPv4 header
- 60 bytes TCP header
- a small gso_size like 8
virtio_net_hdr_to_skb() would declare this packet as a normal GSO packet, because it would see 40 bytes of payload, bigger than gso_size.
We need to make detect this case to not underflow qdisc_skb_cb(skb)->pkt_len.
References
- https://access.redhat.com/security/cve/CVE-2024-49948
- https://git.kernel.org/stable/c/1eebe602a8d8264a12e35e39d0645fa88dbbacdd
- https://git.kernel.org/stable/c/2415f465730e48b6e38da1c7c097317bf5dd2d20
- https://git.kernel.org/stable/c/27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4
- https://git.kernel.org/stable/c/473426a1d53a68dd1e718e6cd00d57936993fa6c
- https://git.kernel.org/stable/c/566a931a1436d0e0ad13708ea55479b95426213c
- https://git.kernel.org/stable/c/9b0ee571d20a238a22722126abdfde61f1b2bdd0
- https://git.kernel.org/stable/c/ab9a9a9e9647392a19e7a885b08000e89c86b535
- https://git.kernel.org/stable/c/d7d1a28f5dd57b4d83def876f8d7b4403bd37df9
- https://git.kernel.org/stable/c/ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2