CVE-2025-40292 (GCVE-0-2025-40292)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2025-12-08 00:46
VLAI?
Title
virtio-net: fix received length check in big packets
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix received length check in big packets Since commit 4959aebba8c0 ("virtio-net: use mtu size as buffer length for big packets"), when guest gso is off, the allocated size for big packets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on negotiated MTU. The number of allocated frags for big packets is stored in vi->big_packets_num_skbfrags. Because the host announced buffer length can be malicious (e.g. the host vhost_net driver's get_rx_bufs is modified to announce incorrect length), we need a check in virtio_net receive path. Currently, the check is not adapted to the new change which can lead to NULL page pointer dereference in the below while loop when receiving length that is larger than the allocated one. This commit fixes the received length check corresponding to the new change.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4959aebba8c06992abafa09d1e80965e0825af54 , < 82f9028e83944a9eee5229cbc6fee9be1de8a62d (git)
Affected: 4959aebba8c06992abafa09d1e80965e0825af54 , < 946dec89c41726b94d31147ec528b96af0be1b5a (git)
Affected: 4959aebba8c06992abafa09d1e80965e0825af54 , < 82fe78065450d2d07f36a22e2b6b44955cf5ca5b (git)
Affected: 4959aebba8c06992abafa09d1e80965e0825af54 , < 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 (git)
Affected: 4959aebba8c06992abafa09d1e80965e0825af54 , < 0c716703965ffc5ef4311b65cb5d84a703784717 (git)
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    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: fix received length check in big packets\n\nSince commit 4959aebba8c0 (\"virtio-net: use mtu size as buffer length\nfor big packets\"), when guest gso is off, the allocated size for big\npackets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on\nnegotiated MTU. The number of allocated frags for big packets is stored\nin vi-\u003ebig_packets_num_skbfrags.\n\nBecause the host announced buffer length can be malicious (e.g. the host\nvhost_net driver\u0027s get_rx_bufs is modified to announce incorrect\nlength), we need a check in virtio_net receive path. Currently, the\ncheck is not adapted to the new change which can lead to NULL page\npointer dereference in the below while loop when receiving length that\nis larger than the allocated one.\n\nThis commit fixes the received length check corresponding to the new\nchange."
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        "dateUpdated": "2025-12-08T00:46:15.761Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2025-40292",
    "datePublished": "2025-12-08T00:46:15.761Z",
    "dateReserved": "2025-04-16T07:20:57.185Z",
    "dateUpdated": "2025-12-08T00:46:15.761Z",
    "state": "PUBLISHED"
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  }
}


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