CVE - CVE-2024-50163

CVE-ID
CVE-2024-50163	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Make sure internal and UAPI bpf_redirect flags don't overlap The bpf_redirect_info is shared between the SKB and XDP redirect paths, and the two paths use the same numeric flag values in the ri->flags field (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that if skb bpf_redirect_neigh() is used with a non-NULL params argument and, subsequently, an XDP redirect is performed using the same bpf_redirect_info struct, the XDP path will get confused and end up crashing, which syzbot managed to trigger. With the stack-allocated bpf_redirect_info, the structure is no longer shared between the SKB and XDP paths, so the crash doesn't happen anymore. However, different code paths using identically-numbered flag values in the same struct field still seems like a bit of a mess, so this patch cleans that up by moving the flag definitions together and redefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap with the flags used for XDP. It also adds a BUILD_BUG_ON() check to make sure the overlap is not re-introduced by mistake.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16 URL:https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16 MISC:https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3 URL:https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3 MISC:https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466 URL:https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466 MISC:https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962 URL:https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962 MISC:https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826 URL:https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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