CVE-2024-56593

Advisory lineage Upstream: 0 Downstream: 59
Modified
Published: 27 Dec 2024, 14:51
Last modified:11 May 2026, 20:55

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (cve.org)
EPSS Score
<0.01% LOW
0% probability -0.03%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 Dec 2024, 14:51
Published
Vulnerability first disclosed
11 May 2026, 20:55
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • linux•linux

    ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 342f87d263462c2670b77ea9a32074cab2ac6fa1 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 7522d7d745d13fbeff3350fe6aa56c8dae263571 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 67a25ea28f8ec1da8894f2f115d01d3becf67dc7 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 07c020c6d14d29e5a3ea4e4576b8ecf956a80834 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 34941321b516bd7c6103bd01287d71a1804d19d3 | ≥ af1fa210f4fc6e304b859b386a3c8a266b1110ab, < 857282b819cbaa0675aaab1e7542e2c0579f52d7 | 3.15

  • linux•linux_kernel

    < 5.4.287 | ≥ 5.5, < 5.10.231 | ≥ 5.11, < 5.15.174 | ≥ 5.16, < 6.1.120 | ≥ 6.2, < 6.6.66 | ≥ 6.7, < 6.12.5

References (9)