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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2024-56593 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix oops due to NULL pointer dereference in brcmf_sdiod_sglist_rw() This patch fixes a NULL pointer dereference bug in brcmfmac that occurs when a high 'sd_sgentry_align' value applies (e.g. 512) and a lot of queued SKBs are sent from the pkt queue. The problem is the number of entries in the pre-allocated sgtable, it is nents = max(rxglom_size, txglom_size) + max(rxglom_size, txglom_size) >> 4 + 1. Given the default [rt]xglom_size=32 it's actually 35 which is too small. Worst case, the pkt queue can end up with 64 SKBs. This occurs when a new SKB is added for each original SKB if tailroom isn't enough to hold tail_pad. At least one sg entry is needed for each SKB. So, eventually the "skb_queue_walk loop" in brcmf_sdiod_sglist_rw may run out of sg entries. This makes sg_next return NULL and this causes the oops. The patch sets nents to max(rxglom_size, txglom_size) * 2 to be able handle the worst-case. Btw. this requires only 64-35=29 * 16 (or 20 if CONFIG_NEED_SG_DMA_LENGTH) = 464 additional bytes of memory.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/07c020c6d14d29e5a3ea4e4576b8ecf956a80834 Patch 
https://git.kernel.org/stable/c/342f87d263462c2670b77ea9a32074cab2ac6fa1 Patch 
https://git.kernel.org/stable/c/34941321b516bd7c6103bd01287d71a1804d19d3 Patch 
https://git.kernel.org/stable/c/67a25ea28f8ec1da8894f2f115d01d3becf67dc7 Patch 
https://git.kernel.org/stable/c/7522d7d745d13fbeff3350fe6aa56c8dae263571 Patch 
https://git.kernel.org/stable/c/857282b819cbaa0675aaab1e7542e2c0579f52d7 Patch 
https://git.kernel.org/stable/c/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-56593
NVD Published Date:
12/27/2024
NVD Last Modified:
01/08/2025
Source:
kernel.org