CVE-2024-56593

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-56593
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.

5.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link 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
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

08 Jan 2025, 16:44

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 - () https://git.kernel.org/stable/c/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 - Patch
References () https://git.kernel.org/stable/c/7522d7d745d13fbeff3350fe6aa56c8dae263571 - () https://git.kernel.org/stable/c/7522d7d745d13fbeff3350fe6aa56c8dae263571 - Patch
References () https://git.kernel.org/stable/c/34941321b516bd7c6103bd01287d71a1804d19d3 - () https://git.kernel.org/stable/c/34941321b516bd7c6103bd01287d71a1804d19d3 - Patch
References () https://git.kernel.org/stable/c/857282b819cbaa0675aaab1e7542e2c0579f52d7 - () https://git.kernel.org/stable/c/857282b819cbaa0675aaab1e7542e2c0579f52d7 - Patch
References () https://git.kernel.org/stable/c/07c020c6d14d29e5a3ea4e4576b8ecf956a80834 - () https://git.kernel.org/stable/c/07c020c6d14d29e5a3ea4e4576b8ecf956a80834 - Patch
References () https://git.kernel.org/stable/c/342f87d263462c2670b77ea9a32074cab2ac6fa1 - () https://git.kernel.org/stable/c/342f87d263462c2670b77ea9a32074cab2ac6fa1 - Patch
References () https://git.kernel.org/stable/c/67a25ea28f8ec1da8894f2f115d01d3becf67dc7 - () https://git.kernel.org/stable/c/67a25ea28f8ec1da8894f2f115d01d3becf67dc7 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
CWE CWE-476

27 Dec 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-12-27 15:15

Updated : 2025-01-08 16:44

NVD link : CVE-2024-56593

Mitre link : CVE-2024-56593

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference