High severity · published Jun 9, 2026
CVE-2026-46320
tap: free page on error paths in tap_get_user_xdp()
7.4
CVSS
0.3%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
tap: free page on error paths in tap_get_user_xdp()
tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,
and returns -ENOMEM when build_skb() fails. Both paths jump to the err
label without freeing the page that vhost_net_build_xdp() allocated for
the frame. tap_sendmsg() discards the per-buffer return value and always
returns 0, so vhost_tx_batch() takes the success path and never frees
the page; each rejected frame in a batch leaks one page-frag chunk.
Free the page on both error paths, before the skb is built. This is the
tap counterpart of the same leak in tun_xdp_one().
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.20 before 5.10.259; 5.11 before 5.15.210; 5.16 before 6.1.176; 6.2 before 6.6.143; 6.7 before 6.12.94; 6.13 before 6.18.36; +6 more · source: NVD
LI
Linux · Linux
0efac27791ee068075d80f07c55a229b1335ce12 before 8d03e65eb6cfbffec471a6b65416f93679bf3286; 0efac27791ee068075d80f07c55a229b1335ce12 before f979971835dddbca86cf99e3b2e2b94a408a1ab2; 0efac27791ee068075d80f07c55a229b1335ce12 before 3f52a86a482a69294c50a5a2a097bd6f4104990a; 0efac27791ee068075d80f07c55a229b1335ce12 before d30aac0fa00ca0afc3e08174cf7f974a66bdcf05; 0efac27791ee068075d80f07c55a229b1335ce12 before d68eab61944a9b0826fa2e954e42db1aa3201b7a; 0efac27791ee068075d80f07c55a229b1335ce12 before e27c17346628cb56843a83f93ac63c314c00f388; +3 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46320
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46320
Patch
https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d
Patch
https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2
Patch
https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a
Patch
https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286
Patch
https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05
Patch
https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a
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