Linux Kernel up to 6.12.4 brcmf_sdiod_sglist_rw sd_sgentry_align null pointer dereference

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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.4. It has been declared as critical. Affected is the function brcmf_sdiod_sglist_rw. The manipulation of the argument sd_sgentry_align results in null pointer dereference. This vulnerability is identified as CVE-2024-56593. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.4. Affected is the function brcmf_sdiod_sglist_rw. The manipulation of the argument sd_sgentry_align with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2024-56593 since 12/27/2024. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 216224 (Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2025-20100)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66 or 6.12.5 eliminates this vulnerability. Applying the patch 342f87d263462c2670b77ea9a32074cab2ac6fa1/7522d7d745d13fbeff3350fe6aa56c8dae263571/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68/67a25ea28f8ec1da8894f2f115d01d3becf67dc7/07c020c6d14d29e5a3ea4e4576b8ecf956a80834/34941321b516bd7c6103bd01287d71a1804d19d3/857282b819cbaa0675aaab1e7542e2c0579f52d7 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (216224) and CERT Bund (WID-SEC-2024-3762). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • RESF Rocky Linux
  • Dell NetWorker
  • Dell Avamar
  • Red Hat OpenShift
  • IBM QRadar SIEM
  • Dell PowerProtect Data Domain
  • Open Source Linux Kernel
  • IBM DataPower Gateway
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 216224
Nessus Name: Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2025-20100)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.287/5.10.231/5.15.174/6.1.120/6.6.66/6.12.5
Patch: 342f87d263462c2670b77ea9a32074cab2ac6fa1/7522d7d745d13fbeff3350fe6aa56c8dae263571/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68/67a25ea28f8ec1da8894f2f115d01d3becf67dc7/07c020c6d14d29e5a3ea4e4576b8ecf956a80834/34941321b516bd7c6103bd01287d71a1804d19d3/857282b819cbaa0675aaab1e7542e2c0579f52d7

Timelineinfo

12/27/2024 🔍
12/27/2024 +0 days 🔍
12/27/2024 +0 days 🔍
01/05/2026 +374 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-56593 (🔍)
GCVE (CVE): GCVE-0-2024-56593
GCVE (VulDB): GCVE-100-289596
CERT Bund: WID-SEC-2024-3762 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/27/2024 18:58
Updated: 01/05/2026 07:56
Changes: 12/27/2024 18:58 (59), 02/13/2025 12:41 (2), 07/25/2025 03:24 (7), 01/05/2026 07:56 (1)
Complete: 🔍
Cache ID: 216::103

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