CVE-2024-49850

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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708	Patch
https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4	Patch
https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e	Patch
https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f	Patch
https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

No history.

Information

Published : 2024-10-21 13:15

Updated : 2024-10-22 16:12

NVD link : CVE-2024-49850

Mitre link : CVE-2024-49850

CVE.ORG link : CVE-2024-49850

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

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