CVE-2024-42082: xdp: Remove WARN() from __xdp_reg_mem_model()
First published: Mon Jul 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: xdp: Remove WARN() from __xdp_reg_mem_model() syzkaller reports a warning in __xdp_reg_mem_model(). The warning occurs only if __mem_id_init_hash_table() returns an error. It returns the error in two cases: 1. memory allocation fails; 2. rhashtable_init() fails when some fields of rhashtable_params struct are not initialized properly. The second case cannot happen since there is a static const rhashtable_params struct with valid fields. So, warning is only triggered when there is a problem with memory allocation. Thus, there is no sense in using WARN() to handle this error and it can be safely removed. WARNING: CPU: 0 PID: 5065 at net/core/xdp.c:299 __xdp_reg_mem_model+0x2d9/0x650 net/core/xdp.c:299 CPU: 0 PID: 5065 Comm: syz-executor883 Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__xdp_reg_mem_model+0x2d9/0x650 net/core/xdp.c:299 Call Trace: xdp_reg_mem_model+0x22/0x40 net/core/xdp.c:344 xdp_test_run_setup net/bpf/test_run.c:188 [inline] bpf_test_run_xdp_live+0x365/0x1e90 net/bpf/test_run.c:377 bpf_prog_test_run_xdp+0x813/0x11b0 net/bpf/test_run.c:1267 bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4240 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5649 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Found by Linux Verification Center (linuxtesting.org) with syzkaller.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10.221 | 5.10.221 |
| redhat/kernel | <5.15.162 | 5.15.162 |
| redhat/kernel | <6.1.97 | 6.1.97 |
| redhat/kernel | <6.6.37 | 6.6.37 |
| redhat/kernel | <6.9.8 | 6.9.8 |
| redhat/kernel | <6.10 | 6.10 |
| Linux Kernel | <4.18 | |
| Linux Kernel | >=4.19<5.10.221 | |
| Linux Kernel | >=5.11<5.15.162 | |
| Linux Kernel | >=5.16<6.1.97 | |
| Linux Kernel | >=6.2<6.6.37 | |
| Linux Kernel | >=6.7<6.9.8 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 | |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/1095b8efbb13a6a5fa583ed373ee1ccab29da2d0
- https://git.kernel.org/stable/c/14e51ea78b4ccacb7acb1346b9241bb790a2054c
- https://git.kernel.org/stable/c/1d3e3b3aa2cbe9bc7db9a7f8673a9fa6d2990d54
- https://git.kernel.org/stable/c/4e0c539ee265d5c6e7fa7d229cd4aa7bc01816e2
- https://git.kernel.org/stable/c/7e9f79428372c6eab92271390851be34ab26bfb4
- https://git.kernel.org/stable/c/f92298b0467fd77edc4c1a2c3e48833e69840ec4
- https://git.kernel.org/linus/7e9f79428372c6eab92271390851be34ab26bfb4
- https://security-tracker.debian.org/tracker/CVE-2024-42082
- https://lore.kernel.org/linux-cve-announce/2024072956-CVE-2024-42082-8411@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2301721
- https://access.redhat.com/errata/RHSA-2024:6567
- https://bugzilla.redhat.com/show_bug.cgi?id=2300520
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42082
- https://nvd.nist.gov/vuln/detail/CVE-2024-42082
- https://launchpad.net/bugs/cve/CVE-2024-42082
- https://ubuntu.com/security/CVE-2024-42082
Frequently Asked Questions
What is the severity of CVE-2024-42082?
The severity of CVE-2024-42082 is considered moderate due to the warning generated in the Linux kernel when certain conditions are met.
How do I fix CVE-2024-42082?
To fix CVE-2024-42082, upgrade your Linux kernel to one of the patched versions including 5.10.221, 5.15.162, 6.1.97, 6.6.37, or later.
Which Linux kernel versions are affected by CVE-2024-42082?
CVE-2024-42082 affects Linux kernel versions from 4.18 up to but not including 5.10.221, 5.11 to 5.15.162, 5.16 to 6.1.97, and 6.2 to 6.6.37.
Is CVE-2024-42082 limited to any specific Linux distributions?
CVE-2024-42082 is reported on both Red Hat and Debian-based distributions with specific kernel versions affected.
What is the impact of CVE-2024-42082 on system performance?
The impact of CVE-2024-42082 is limited to the generation of warnings in the log, which may not affect overall system performance significantly.
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