CVE-2026-52981

neigh: let neigh_xmit take skb ownership

State: Published
Severity: 7.5 High
Published: Jun 24, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

CWE-401 Missing Release of Memory after Effective Lifetime

Affected Products

Product	Versions
LinuxLinux	4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 8a89054a1ec0767aec25ed2bbac933da6ba3cf5aAffected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 9247d59ca15bf60a57dca08103f055d8a4340877Affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 0084712e0bee204b284510cdb63182fd5a30c2b7Affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 63063ba60d2dc334e34f1e3f9271d7f3f6f30307Affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 445e45a2c3a078316a62d2d331a570cf34ef5079Affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 4438113be604ee67a7bf4f81da6e1cca41332ce4Affected
LinuxLinux	4.1Affected before 4.1Not affected 6.1.175 through 6.1.Not affected 6.6.141 through 6.6.Not affected 6.12.91 through 6.12.Not affected 6.18.33 through 6.18.Not affected 7.0.10 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 8a89054a1ec0767aec25ed2bbac933da6ba3cf5aAffected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 9247d59ca15bf60a57dca08103f055d8a4340877Affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 0084712e0bee204b284510cdb63182fd5a30c2b7Affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 63063ba60d2dc334e34f1e3f9271d7f3f6f30307Affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 445e45a2c3a078316a62d2d331a570cf34ef5079Affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 to before 4438113be604ee67a7bf4f81da6e1cca41332ce4Affected

LinuxLinux

4.1Affected
before 4.1Not affected
6.1.175 through 6.1.*Not affected
6.6.141 through 6.6.*Not affected
6.12.91 through 6.12.*Not affected
6.18.33 through 6.18.*Not affected
7.0.10 through 7.0.*Not affected
7.1 and laterNot affected

References

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