CVE-2026-52981 (GCVE-0-2026-52981)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-06-28 06:37
VLAI
Title
neigh: let neigh_xmit take skb ownership
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a (git)
Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 9247d59ca15bf60a57dca08103f055d8a4340877 (git)
Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 0084712e0bee204b284510cdb63182fd5a30c2b7 (git)
Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 63063ba60d2dc334e34f1e3f9271d7f3f6f30307 (git)
Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 445e45a2c3a078316a62d2d331a570cf34ef5079 (git)
Affected: 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 , < 4438113be604ee67a7bf4f81da6e1cca41332ce4 (git)
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Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.