CVE-2024-49850: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.17<6.1.113 | |
| Linux Kernel | >=6.2<6.6.54 | |
| Linux Kernel | >=6.7<6.10.13 | |
| Linux Kernel | >=6.11<6.11.2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f
- https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708
- https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e
- https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218
- https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49850
- https://nvd.nist.gov/vuln/detail/CVE-2024-49850
- https://launchpad.net/bugs/cve/CVE-2024-49850
- https://security-tracker.debian.org/tracker/CVE-2024-49850
- https://ubuntu.com/security/CVE-2024-49850
- https://git.kernel.org/linus/3d2786d65aaa954ebd3fcc033ada433e10da21c4
Frequently Asked Questions
What is the severity of CVE-2024-49850?
CVE-2024-49850 has been classified as a moderate severity vulnerability affecting the Linux kernel.
How do I fix CVE-2024-49850?
To resolve CVE-2024-49850, update the Linux kernel to a version above 6.1.113, 6.6.54, 6.10.13, or 6.11.2.
What is CVE-2024-49850 about?
CVE-2024-49850 concerns a vulnerability in the Linux kernel related to the mishandling of malformed BPF_CORE_TYPE_ID_LOCAL relocations.
Which Linux kernel versions are affected by CVE-2024-49850?
Linux kernel versions between 5.17 and 6.1.113, 6.2 and 6.6.54, 6.7 and 6.10.13, and 6.11 and 6.11.2 are affected by CVE-2024-49850.
Are there any potential impacts of CVE-2024-49850?
CVE-2024-49850 may lead to application crashes or unexpected behavior in systems that utilize the affected Linux kernel versions.
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