High 7.5Published Jun 24, 2026

CVE-2026-52981neigh: let neigh_xmit take skb ownership

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-401
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a; from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 9247d59ca15bf60a57dca08103f055d8a4340877; from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 0084712e0bee204b284510cdb63182fd5a30c2b7; from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 63063ba60d2dc334e34f1e3f9271d7f3f6f30307; from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 445e45a2c3a078316a62d2d331a570cf34ef5079; from 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 before 4438113be604ee67a7bf4f81da6e1cca41332ce4	CNA record
linux linux_kernel linux:linux_kernel	from 4.1 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1	NVD

References

References

https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a	patch
https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877	patch
https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7	patch
https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307	patch
https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079	patch
https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.