CVE-2026-43098 (GCVE-0-2026-43098)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
nfc: s3fwrn5: allocate rx skb before consuming bytes
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: s3fwrn5: allocate rx skb before consuming bytes s3fwrn82_uart_read() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already deliver a complete frame before allocating a fresh receive buffer. If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8(). Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3f52c2cb7e3ada37513dabb69a22cf917dba754f , < d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156 (git)
Affected: 3f52c2cb7e3ada37513dabb69a22cf917dba754f , < 7c31f7a599cf00fad3c204092a91a924126c67e4 (git)
Affected: 3f52c2cb7e3ada37513dabb69a22cf917dba754f , < 6d931680a9851481c3243689488eafed08eeff71 (git)
Affected: 3f52c2cb7e3ada37513dabb69a22cf917dba754f , < 09822d3d6f68a0cdc4626e0c507324a4927f55a9 (git)
Affected: 3f52c2cb7e3ada37513dabb69a22cf917dba754f , < 5c14a19d5b1645cce1cb1252833d70b23635b632 (git)
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    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/nfc/s3fwrn5/uart.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: s3fwrn5: allocate rx skb before consuming bytes\n\ns3fwrn82_uart_read() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already\ndeliver a complete frame before allocating a fresh receive buffer.\n\nIf that alloc_skb() fails, the callback returns 0 even though it has\nalready consumed bytes, and it leaves recv_skb as NULL for the next\nreceive callback. That breaks the receive_buf() accounting contract and\ncan also lead to a NULL dereference on the next skb_put_u8().\n\nAllocate the receive skb lazily before consuming the next byte instead.\nIf allocation fails, return the number of bytes already accepted."
        }
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        "dateUpdated": "2026-05-06T07:40:28.845Z",
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43098",
    "datePublished": "2026-05-06T07:40:28.845Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-05-06T07:40:28.845Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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