CVE-2024-56593 (GCVE-0-2024-56593)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-01-05 10:55
VLAI?
Title
wifi: brcmfmac: Fix oops due to NULL pointer dereference in brcmf_sdiod_sglist_rw()
Summary
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 342f87d263462c2670b77ea9a32074cab2ac6fa1 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 7522d7d745d13fbeff3350fe6aa56c8dae263571 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < dfb3f9d3f602602de208da7bdcc0f6d5ee74af68 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 67a25ea28f8ec1da8894f2f115d01d3becf67dc7 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 07c020c6d14d29e5a3ea4e4576b8ecf956a80834 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 34941321b516bd7c6103bd01287d71a1804d19d3 (git)
Affected: af1fa210f4fc6e304b859b386a3c8a266b1110ab , < 857282b819cbaa0675aaab1e7542e2c0579f52d7 (git)
Create a notification for this product.
    Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "cveMetadata": "{\"cveId\": \"CVE-2024-56593\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:55:56.242Z\", \"dateReserved\": \"2024-12-27T14:03:06.003Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T14:51:00.466Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.