CVE-2026-46320
tap: free page on error paths in tap_get_user_xdp()
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().
INFO
Published Date :
June 9, 2026, 1:16 p.m.
Last Modified :
July 23, 2026, 8:10 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply kernel patches that fix tap_get_user_xdp().
- Ensure pages are freed before the skb is built.
- Review tap_sendmsg() for proper error handling.
Public PoC/Exploit Available at Github
CVE-2026-46320 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46320.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46320 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46320
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46320 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46320 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: el kernel de Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: tap: liberar página en las rutas de error en tap_get_user_xdp() tap_get_user_xdp() rechaza una trama más corta que ETH_HLEN con -EINVAL, y devuelve -ENOMEM cuando build_skb() falla. Ambas rutas saltan a la etiqueta err sin liberar la página que vhost_net_build_xdp() asignó para la trama. tap_sendmsg() descarta el valor de retorno por búfer y siempre devuelve 0, por lo que vhost_tx_batch() toma la ruta de éxito y nunca libera la página; cada trama rechazada en un lote filtra un fragmento de página. Liberar la página en ambas rutas de error, antes de que se construya el skb. Esta es la contraparte de tap de la misma fuga en tun_xdp_one(). -
Initial Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.10.259 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.12 Added Reference Type kernel.org: https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 19, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a Added Reference https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286 Added Reference https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 Added Reference https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a Added Reference https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388 Added Reference https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2 Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '18a84c35842e19cd3c5534d8cee73d31863f696d', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2', 'versionType': 'git'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '8d03e65eb6cfbffec471a6b65416f93679bf3286', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': 'f979971835dddbca86cf99e3b2e2b94a408a1ab2', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '3f52a86a482a69294c50a5a2a097bd6f4104990a', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': 'd30aac0fa00ca0afc3e08174cf7f974a66bdcf05', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': 'd68eab61944a9b0826fa2e954e42db1aa3201b7a', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': 'e27c17346628cb56843a83f93ac63c314c00f388', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '18a84c35842e19cd3c5534d8cee73d31863f696d', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2', 'versionType': 'git'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '18a84c35842e19cd3c5534d8cee73d31863f696d', 'versionType': 'git'}, {'status': 'affected', 'version': '0efac27791ee068075d80f07c55a229b1335ce12', 'lessThan': '3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2', 'versionType': 'git'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/tap.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 09, 2026
Action Type Old Value New Value Added 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(). Added Reference https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d Added Reference https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2