# CVE-2026-72393: linux: In the Linux kernel, the following vulnerability has been resolved:  eth: fbnic: don't cache shinfo across skb reallo...

CVE-2026-72393 is fixed in linux on 1 platform by DEBIAN-CVE-2026-72393 (version 7.1.5-1), released August 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-72393
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2026

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-72393](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72393.md) | Aug 15, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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