CVE-2024-49850

bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

MITRE

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.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-10-21 CVE Reserved
2024-10-21 CVE Published
2024-10-23 EPSS Updated
2024-11-19 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/74753e1462e77349525daf9eb60ea21ed92d3a97	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f	2024-10-17
https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708	2024-10-04
https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e	2024-10-04
https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218	2024-10-04
https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4	2024-08-22

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.1.113 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.1.113"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.6.54 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.6.54"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.10.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.10.13"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.11.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.11.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.12"		en		Affected