CVE-2024-45020
Linux Kernel BPF Kernel Verifier Out-of-Bounds Read
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a kernel verifier crash in stacksafe() Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code: if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false; The 'i' iterates old->allocated_stack. If cur->allocated_stack < old->allocated_stack the out-of-bound access will happen. To fix the issue add 'i >= cur->allocated_stack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.
INFO
Published Date :
Sept. 11, 2024, 4:15 p.m.
Last Modified :
Sept. 13, 2024, 4:36 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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CVE-2024-45020.
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The following list is the news that have been mention
CVE-2024-45020 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-45020 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Sep. 13, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b No Types Assigned https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b Patch Changed Reference Type https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08 No Types Assigned https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08 Patch Changed Reference Type https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25 No Types Assigned https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25 Patch Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.15 up to (excluding) 6.6.48 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.7 *cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:* -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 11, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a kernel verifier crash in stacksafe() Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code: if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false; The 'i' iterates old->allocated_stack. If cur->allocated_stack < old->allocated_stack the out-of-bound access will happen. To fix the issue add 'i >= cur->allocated_stack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal. Added Reference kernel.org https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-45020 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-45020
weaknesses.