CVE-2024-56593
wifi: brcmfmac: Fix oops due to NULL pointer dereference in brcmf_sdiod_sglist_rw()
- 5.5MediumCVSS base score
- 0.24%Exploitation in 30 daysEPSS · top 85% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 17 months later
· 17 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 342f87d263462c2670b77ea9a32074cab2ac6fa1
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 7522d7d745d13fbeff3350fe6aa56c8dae263571
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < dfb3f9d3f602602de208da7bdcc0f6d5ee74af68
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 67a25ea28f8ec1da8894f2f115d01d3becf67dc7
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 07c020c6d14d29e5a3ea4e4576b8ecf956a80834
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 34941321b516bd7c6103bd01287d71a1804d19d3
- affected af1fa210f4fc6e304b859b386a3c8a266b1110ab – < 857282b819cbaa0675aaab1e7542e2c0579f52d7
- affected 3.15
- unaffected < 3.15
- unaffected 5.4.287 – ≤ 5.4.*
- unaffected 5.10.231 – ≤ 5.10.*
- unaffected 5.15.174 – ≤ 5.15.*
- unaffected 6.1.120 – ≤ 6.1.*
- unaffected 6.6.66 – ≤ 6.6.*
- unaffected 6.12.5 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References9
- https://git.kernel.org/stable/c/342f87d263462c2670b77ea9a32074cab2ac6fa1 (opens in a new tab)
- https://git.kernel.org/stable/c/7522d7d745d13fbeff3350fe6aa56c8dae263571 (opens in a new tab)
- https://git.kernel.org/stable/c/dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 (opens in a new tab)
- https://git.kernel.org/stable/c/67a25ea28f8ec1da8894f2f115d01d3becf67dc7 (opens in a new tab)
- https://git.kernel.org/stable/c/07c020c6d14d29e5a3ea4e4576b8ecf956a80834 (opens in a new tab)
- https://git.kernel.org/stable/c/34941321b516bd7c6103bd01287d71a1804d19d3 (opens in a new tab)
- https://git.kernel.org/stable/c/857282b819cbaa0675aaab1e7542e2c0579f52d7 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-53241 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-56593)Record last updated .