CVE-2024-49850

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Source
https://cve.org/CVERecord?id=CVE-2024-49850
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49850.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-49850
Downstream
Related
Published
2024-10-21T12:18:44.098Z
Modified
2026-03-20T12:39:23.635308Z
Summary
bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
Details

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:

.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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49850.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
74753e1462e77349525daf9eb60ea21ed92d3a97
Fixed
dc7ce14f00bcd50641f2110b7a32aa6552e0780f
Fixed
2288b54b96dcb55bedebcef3572bb8821fc5e708
Fixed
584cd3ff792e1edbea20b2a7df55897159b0be3e
Fixed
e7e9c5b2dda29067332df2a85b0141a92b41f218
Fixed
3d2786d65aaa954ebd3fcc033ada433e10da21c4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49850.json"