CVE-2024-50018 Vulnerability Details

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CVE-2024-50018 Metadata Quick Info

CVE Published: 21/10/2024 | CVE Updated: 19/11/2024 | CVE Year: 2024
Source: Linux | Vendor: Linux | Product: Linux
Status : PUBLISHED

CVE-2024-50018 Description

In the Linux kernel, the following vulnerability has been resolved: net: napi: Prevent overflow of napi_defer_hard_irqs In commit 6f8b12d661d0 ("net: napi: add hard irqs deferral feature") napi_defer_irqs was added to net_device and napi_defer_irqs_count was added to napi_struct, both as type int. This value never goes below zero, so there is not reason for it to be a signed int. Change the type for both from int to u32, and add an overflow check to sysfs to limit the value to S32_MAX. The limit of S32_MAX was chosen because the practical limit before this patch was S32_MAX (anything larger was an overflow) and thus there are no behavioral changes introduced. If the extra bit is needed in the future, the limit can be raised. Before this patch: $ sudo bash -c \'echo 2147483649 > /sys/class/net/eth4/napi_defer_hard_irqs\' $ cat /sys/class/net/eth4/napi_defer_hard_irqs -2147483647 After this patch: $ sudo bash -c \'echo 2147483649 > /sys/class/net/eth4/napi_defer_hard_irqs\' bash: line 0: echo: write error: Numerical result out of range Similarly, /sys/class/net/XXXXX/tx_queue_len is defined as unsigned: include/linux/netdevice.h: unsigned int tx_queue_len; And has an overflow check: dev_change_tx_queue_len(..., unsigned long new_len): if (new_len != (unsigned int)new_len) return -ERANGE;

Metrics

CVSS Version: 3.1 | Base Score: n/a
Vector: n/a

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Weakness Enumeration (CWE)

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Source: Linux

Common Attack Pattern Enumeration and Classification (CAPEC)

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Source: NVD (National Vulnerability Database).