GHSA-H6C6-RXF5-Q7RW

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

eth: fbnic: don't cache shinfo across skb realloc

fbnic_tx_lso() calls skb_cow_head() which may reallocate the skb including the shared info. We can't use the pointer calculated before the call.

BUG: KASAN: slab-use-after-free in fbnic_tx_lso.isra.0+0x668/0x8e0
Read of size 4 at addr ff110000262edd98 by task swapper/5/0
Call Trace:
 fbnic_tx_lso.isra.0+0x668/0x8e0
 fbnic_xmit_frame+0x622/0xba0
 dev_hard_start_xmit+0xf4/0x620

Allocated by task 8653:
 __alloc_skb+0x11e/0x5f0
 alloc_skb_with_frags+0xcc/0x6c0
 sock_alloc_send_pskb+0x327/0x3f0
 __ip_append_data+0x188b/0x47a0
 ip_make_skb+0x24a/0x300
 udp_sendmsg+0x14d2/0x21e0

Freed by task 0:
 kfree+0x123/0x5a0
 pskb_expand_head+0x36c/0xfa0
 fbnic_tx_lso.isra.0+0x500/0x8e0
 fbnic_xmit_frame+0x622/0xba0
 dev_hard_start_xmit+0xf4/0x620
 sch_direct_xmit+0x25b/0x1100

The buggy address belongs to the object at ff110000262edc40
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 344 bytes inside of
 freed 640-byte region [ff110000262edc40, ff110000262ede
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72393"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:12Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: don\u0027t cache shinfo across skb realloc\n\nfbnic_tx_lso() calls skb_cow_head() which may reallocate the skb\nincluding the shared info. We can\u0027t use the pointer calculated\nbefore the call.\n\n    BUG: KASAN: slab-use-after-free in fbnic_tx_lso.isra.0+0x668/0x8e0\n    Read of size 4 at addr ff110000262edd98 by task swapper/5/0\n    Call Trace:\n     fbnic_tx_lso.isra.0+0x668/0x8e0\n     fbnic_xmit_frame+0x622/0xba0\n     dev_hard_start_xmit+0xf4/0x620\n\n    Allocated by task 8653:\n     __alloc_skb+0x11e/0x5f0\n     alloc_skb_with_frags+0xcc/0x6c0\n     sock_alloc_send_pskb+0x327/0x3f0\n     __ip_append_data+0x188b/0x47a0\n     ip_make_skb+0x24a/0x300\n     udp_sendmsg+0x14d2/0x21e0\n\n    Freed by task 0:\n     kfree+0x123/0x5a0\n     pskb_expand_head+0x36c/0xfa0\n     fbnic_tx_lso.isra.0+0x500/0x8e0\n     fbnic_xmit_frame+0x622/0xba0\n     dev_hard_start_xmit+0xf4/0x620\n     sch_direct_xmit+0x25b/0x1100\n\n    The buggy address belongs to the object at ff110000262edc40\n     which belongs to the cache skbuff_small_head of size 640\n    The buggy address is located 344 bytes inside of\n     freed 640-byte region [ff110000262edc40, ff110000262ede",
  "id": "GHSA-h6c6-rxf5-q7rw",
  "modified": "2026-08-17T06:33:27Z",
  "published": "2026-08-15T06:32:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72393"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21f304c2aae46625e050c28d979f4b9d83faa85e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62b68b774f06bf52e329f254f0199bc43d350ccf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83df3e2594cd78aa40b1246a19879abb4891945b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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