Critical severity · published Jul 19, 2026
CVE-2026-63857
net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
The transmit loop in airoha_dev_xmit() reads fragment address and length
during its final iteration, when the loop index equals
skb_shinfo(skb)->nr_frags, at which point the fragment data is
uninitialized. While these values are never consumed, the read itself is
unsafe and may trigger a page fault. Fix this by avoiding the fragment
read on the last iteration.
Additionally, move the skb pointer from the first to the last used packet
descriptor, so that airoha_qdma_tx_napi_poll() defers freeing the skb
until the final descriptor is processed.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
23020f04932701d5c8363e60756f12b43b8ed752 before dba5f4959653e4c212beb746594952e8645d1115; 23020f04932701d5c8363e60756f12b43b8ed752 before f670fa4b19ceddc6d215dda4997888ccba9bbc61; 23020f04932701d5c8363e60756f12b43b8ed752 before d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3; 23020f04932701d5c8363e60756f12b43b8ed752 before bde34e84edc8b5571fbde7e941e175a4293ee1eb; 6.11 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63857
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63857
git.kernel.org
https://git.kernel.org/stable/c/bde34e84edc8b5571fbde7e941e175a4293ee1eb
git.kernel.org
https://git.kernel.org/stable/c/d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3
git.kernel.org
https://git.kernel.org/stable/c/dba5f4959653e4c212beb746594952e8645d1115
git.kernel.org
https://git.kernel.org/stable/c/f670fa4b19ceddc6d215dda4997888ccba9bbc61
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