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Review reviewHigh

CVE-2026-52981

Linux Linux, linux kernel

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? Assum...

CVSS
7.5
EPSS
0.53%
41.8% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.53%
Technical severityCVSS 7.5

Vulnerability overview

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? Assum...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a, >= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 9247d59ca15bf60a57dca08103f055d8a4340877, >= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 0084712e0bee204b284510cdb63182fd5a30c2b7, >= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 63063ba60d2dc334e34f1e3f9271d7f3f6f30307, >= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 445e45a2c3a078316a62d2d331a570cf34ef5079, >= 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 < 4438113be604ee67a7bf4f81da6e1cca41332ce4, >= 4.1, >= 4.1 < 6.1.175, >= 6.2 < 6.6.141, >= 6.7 < 6.12.91, >= 6.13 < 6.18.33, >= 6.19 < 7.0.10, 7.1
Fixed versions
6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-401