CVE-2026-52981
neigh: let neigh_xmit take skb ownership
Description
In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 14, 2026, 4:51 p.m.
Remotely Exploit :
Yes !
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
- Ensure SKB ownership is handled consistently.
- Review and manage SKB release paths.
- Apply kernel updates for memory management.
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-2026-52981.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-52981 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-2026-52981
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-52981 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-52981 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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Initial Analysis by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added CWE CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.1 up to (excluding) 6.1.175 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 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': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '8a89054a1ec0767aec25ed2bbac933da6ba3cf5a', 'versionType': 'git'}, {'status': 'affected', 'version': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '9247d59ca15bf60a57dca08103f055d8a4340877', 'versionType': 'git'}, {'status': 'affected', 'version': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '0084712e0bee204b284510cdb63182fd5a30c2b7', 'versionType': 'git'}, {'status': 'affected', 'version': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '63063ba60d2dc334e34f1e3f9271d7f3f6f30307', 'versionType': 'git'}, {'status': 'affected', 'version': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '445e45a2c3a078316a62d2d331a570cf34ef5079', 'versionType': 'git'}, {'status': 'affected', 'version': '4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62', 'lessThan': '4438113be604ee67a7bf4f81da6e1cca41332ce4', 'versionType': 'git'}], 'programFiles': ['net/core/neighbour.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/core/neighbour.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb. Added Reference https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7 Added Reference https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4 Added Reference https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079 Added Reference https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307 Added Reference https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a Added Reference https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877