{"id":"CVE-2026-74560","revision":null,"records":[{"revision":"9dde755eea854943985e13d4fa1a5122","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74560","aliases":[],"title":"xsk: fix buffer leak in xsk_drop_skb() for AF_XDP multi-buffer Tx","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix buffer leak in xsk_drop_skb() for AF_XDP multi-buffer Tx\n\nThis patch is inspired by the check[1] from sashiko. It says when\noverflow happens, the address of cq to be published is invalid.\nActually the severer thing is the whole process of publishing the\naddress of cq in this particular case is not right: it should truely\npublish the address and advance the cached_prod in cq as long as it\nreads descriptors from txq.\n\nThe following is the full analysis.\nxsk_drop_skb() is called in three places, which all discard a partially\nbuilt multi-buffer skb:\n1) xsk_build_skb() -EOVERFLOW error path: packet exceeds MAX_SKB_FRAGS\n2) __xsk_generic_xmit() post-loop cleanup: an invalid descriptor in\n   the TX ring prevents the partial packet from completing\n3) xsk_release(): socket close while xs->skb holds an incomplete packet\n\nIn all three cases, the TX descriptors for the already-processed frags\nhave been consumed from the TX ring (xskq_cons_release), and CQ slots\nhave been reserved. However, xsk_drop_skb() calls xsk_consume_skb()\nwhich cancels the CQ reservations via xsk_cq_cancel_locked(). Since\nthe buffer addresses never appear in the completion queue, userspace\npermanently loses track of these buffers.\n\nFix this by letting consume_skb() trigger the existing xsk_destruct_skb\ndestructor, which already submits buffer addresses to the CQ via\nxsk_cq_submit_addr_locked().\n\nNote that cancelling the descriptors back to the TX ring (via\nxskq_cons_cancel_n) is not a appropriate option because an oversized\npacket that always exceeds MAX_SKB_FRAGS would be retried indefinitely,\nwhich is an obviously deadlock bug in the TX path.\n\nAlso move the desc->addr assignment in xsk_build_skb() above the\noverflow check so that the current descriptor's address is recorded\nbefore a potential -EOVERFLOW jump to free_err, consistent with the\nzerocopy path in xsk_build_skb_zerocopy().\n\n[1]: https://lore.kernel.org/all/20260425041726.85FB3C2BCB2@smtp.kernel.org/","state":0,"publishedAt":"2026-08-15T12:28:03.912+00:00","modifiedAt":"2026-10-21T12:45:58.392+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/xdp/xsk.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"cf24f5a5feeaae34c1a34d1e04f8ac697290427a\",\n                            \"lessThan\": \"c24b3379c0ff00101b9ede54d36f7138d8a02c43\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf24f5a5feeaae34c1a34d1e04f8ac697290427a\",\n                            \"lessThan\": \"05e283466b86e0b25a5209a3eafe87aa9886064a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf24f5a5feeaae34c1a34d1e04f8ac697290427a\",\n                            \"lessThan\": \"a0528ab6af62bf57153caaf8ea28e5fcb0e18fd4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cf24f5a5feeaae34c1a34d1e04f8ac697290427a\",\n                            \"lessThan\": \"a3c8382ebce4780c6b3ace2c09bc342313ac0186\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/xdp/xsk.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c24b3379c0ff00101b9ede54d36f7138d8a02c43","https://git.kernel.org/stable/c/05e283466b86e0b25a5209a3eafe87aa9886064a","https://git.kernel.org/stable/c/a0528ab6af62bf57153caaf8ea28e5fcb0e18fd4","https://git.kernel.org/stable/c/a3c8382ebce4780c6b3ace2c09bc342313ac0186"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74560","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74560","identifiers":["CVE-2026-74560"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-ce0df89a405747cda5b7c61ae0b48fb2","complete":true,"records":13633,"lastAttemptAt":"2026-11-08T10:04:58.8018093+00:00","lastSuccessAt":"2026-11-08T05:08:40.263+00:00","error":null,"lastVerifiedAt":"2026-11-08T05:08:40.263+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-08T10:04:32.7352320+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T10:04:32.735232+00:00","lastSuccessAt":"2026-11-08T10:04:32.958305+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.9583056+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2ca35de6f6b748bea5c32f6d843eca15","complete":true,"records":13645,"lastAttemptAt":"2026-11-08T10:04:58.1666994+00:00","lastSuccessAt":"2026-11-08T10:04:58.163+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:58.163+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-08T10:04:32.5160062+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.5160062+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-08T11:04:36.8284473+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-08T11:04:36.8284473+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-08T10:04:32.6972338+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.6972338+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-8efbf882841c7fda0cba0c3b55677f4781f461b96ab83577ad2701c4eaf88b1e","complete":true,"records":231293,"lastAttemptAt":"2026-11-08T10:04:32.4139557+00:00","lastSuccessAt":"2026-11-08T08:01:14.837451+00:00","error":null,"lastVerifiedAt":"2026-11-08T10:04:32.4139557+00:00","snapshotPublishedAt":"2026-11-08T07:33:16+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}