CVE-2024-35985
Linux Kernel Sched Eevdf Null Deref Buffer Overflow Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf() It was possible to have pick_eevdf() return NULL, which then causes a NULL-deref. This turned out to be due to entity_eligible() returning falsely negative because of a s64 multiplcation overflow. Specifically, reweight_eevdf() computes the vlag without considering the limit placed upon vlag as update_entity_lag() does, and then the scaling multiplication (remember that weight is 20bit fixed point) can overflow. This then leads to the new vruntime being weird which then causes the above entity_eligible() to go side-ways and claim nothing is eligible. Thus limit the range of vlag accordingly. All this was quite rare, but fatal when it does happen.
INFO
Published Date :
May 20, 2024, 10:15 a.m.
Last Modified :
Jan. 16, 2025, 4:43 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
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-35985.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2024-35985 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-35985 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.
-
Initial Analysis by [email protected]
Jan. 16, 2025
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 Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.4 up to (excluding) 6.6.30 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.8.9 *cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c No Types Assigned https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c Patch Changed Reference Type https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c No Types Assigned https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c Patch Changed Reference Type https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe No Types Assigned https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe Patch Changed Reference Type https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe No Types Assigned https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe Patch Changed Reference Type https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb No Types Assigned https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb Patch Changed Reference Type https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb No Types Assigned https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c Added Reference https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe Added Reference https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 29, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 20, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf() It was possible to have pick_eevdf() return NULL, which then causes a NULL-deref. This turned out to be due to entity_eligible() returning falsely negative because of a s64 multiplcation overflow. Specifically, reweight_eevdf() computes the vlag without considering the limit placed upon vlag as update_entity_lag() does, and then the scaling multiplication (remember that weight is 20bit fixed point) can overflow. This then leads to the new vruntime being weird which then causes the above entity_eligible() to go side-ways and claim nothing is eligible. Thus limit the range of vlag accordingly. All this was quite rare, but fatal when it does happen. Added Reference kernel.org https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe [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-2024-35985 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-2024-35985
weaknesses.