{"id":"CVE-2026-52981","summary":"neigh: let neigh_xmit take skb ownership","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nneigh: let neigh_xmit take skb ownership\n\nneigh_xmit always releases the skb, except when no neighbour table is\nfound. But even the first added user of neigh_xmit (mpls) relied on\nneigh_xmit to release the skb (or queue it for tx).\n\nsashiko reported:\n If neigh_xmit() is called with an uninitialized neighbor table (for\n example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT\n and bypasses its internal out_kfree_skb error path.  Because the return\n value of neigh_xmit() is ignored here, does this leak the SKB?\n\nAssume full ownership and remove the last code path that doesn't\nxmit or free skb.","modified":"2026-07-21T09:52:49.254589008Z","published":"2026-06-24T16:28:57.074Z","related":["SUSE-SU-2026:3130-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52981.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079"},{"type":"WEB","url":"https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52981.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52981"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62"},{"fixed":"8a89054a1ec0767aec25ed2bbac933da6ba3cf5a"},{"fixed":"9247d59ca15bf60a57dca08103f055d8a4340877"},{"fixed":"0084712e0bee204b284510cdb63182fd5a30c2b7"},{"fixed":"63063ba60d2dc334e34f1e3f9271d7f3f6f30307"},{"fixed":"445e45a2c3a078316a62d2d331a570cf34ef5079"},{"fixed":"4438113be604ee67a7bf4f81da6e1cca41332ce4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52981.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.1.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52981.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}