Critical 9.8Published Aug 15, 2026

CVE-2026-72393eth: fbnic: don't cache shinfo across skb realloc

Updated under an hour ago (2026-10-19 07:23 UTC)

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Exploited in the last 30 days

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

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b0b0f52042acb324cd39fbefb2b1ae83af8f8ae1 before 83df3e2594cd78aa40b1246a19879abb4891945b; from b0b0f52042acb324cd39fbefb2b1ae83af8f8ae1 before 21f304c2aae46625e050c28d979f4b9d83faa85e; from b0b0f52042acb324cd39fbefb2b1ae83af8f8ae1 before 62b68b774f06bf52e329f254f0199bc43d350ccf	CNA record

References

https://git.kernel.org/stable/c/83df3e2594cd78aa40b1246a19879abb4891945b
https://git.kernel.org/stable/c/21f304c2aae46625e050c28d979f4b9d83faa85e
https://git.kernel.org/stable/c/62b68b774f06bf52e329f254f0199bc43d350ccf

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.