CVE-2024-49850: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
In the Linux kernel, the following vulnerability has been resolved:
bpf: correctly handle malformed BPFCORETYPEIDLOCAL relos
In case of malformed relocation record of kind BPFCORETYPEIDLOCAL referencing a non-existing BTF type, function bpfcorecalcreloinsn 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:
.insnoff = 0, / patch first instruction / .typeid = 100500, / this type id does not exist / .accessstroff = 6, / offset of string "0" / .kind = BPFCORETYPEIDLOCAL,
See the link for original reproducer or next commit for a test case.
Other sources
This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.
— Launchpad
Affected Software
Remediation
Event History
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.