CVE-2024-50203: bpf, arm64: Fix address emission with tag-based KASAN enabled
First published: Fri Nov 08 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix address emission with tag-based KASAN enabled When BPF_TRAMP_F_CALL_ORIG is enabled, the address of a bpf_tramp_image struct on the stack is passed during the size calculation pass and an address on the heap is passed during code generation. This may cause a heap buffer overflow if the heap address is tagged because emit_a64_mov_i64() will emit longer code than it did during the size calculation pass. The same problem could occur without tag-based KASAN if one of the 16-bit words of the stack address happened to be all-ones during the size calculation pass. Fix the problem by assuming the worst case (4 instructions) when calculating the size of the bpf_tramp_image address emission.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.10.3<6.11 | |
| Linux Kernel | >=6.11<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
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Reference Links
- https://git.kernel.org/stable/c/7db1a2121f3c7903b8e397392beec563c3d00950
- https://git.kernel.org/stable/c/a552e2ef5fd1a6c78267cd4ec5a9b49aa11bbb1c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50203
- https://nvd.nist.gov/vuln/detail/CVE-2024-50203
- https://launchpad.net/bugs/cve/CVE-2024-50203
- https://security-tracker.debian.org/tracker/CVE-2024-50203
- https://ubuntu.com/security/CVE-2024-50203
- https://git.kernel.org/linus/a552e2ef5fd1a6c78267cd4ec5a9b49aa11bbb1c
Frequently Asked Questions
What is the severity of CVE-2024-50203?
CVE-2024-50203 has not been assigned a specific severity rating, but it impacts various versions of the Linux kernel.
How do I fix CVE-2024-50203?
To resolve CVE-2024-50203, users should upgrade to a patched version of the Linux kernel that addresses this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-50203?
CVE-2024-50203 affects Linux kernel versions from 6.10.3 to 6.11, as well as specific release candidates of version 6.12.
What kind of vulnerability is CVE-2024-50203?
CVE-2024-50203 is a vulnerability in the Linux kernel's BPF subsystem related to address emission when tag-based KASAN is enabled.
Is CVE-2024-50203 exploitable in a production environment?
The exploitability of CVE-2024-50203 in a production environment depends on the specific use case and configuration of the affected kernel versions.
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