{"cve":{"cve_id":"CVE-2021-47013","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00783,"epss_percentile":0.53035,"epss_as_of":"2026-08-28","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\n\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).\n\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len 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:"4.19.191","version_start_inclusive":true,"version_end":"4.19.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:4.19.191:4.19.*"},{"vendor_slug":"linux","vendor_name":"linux","product_slug":"linux","product_name":"Linux","version_start":"5.4.119","version_start_inclusive":true,"version_end":"5.4.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.4.119:5.4.*"},{"vendor_slug":"linux","vendor_name":"linux","product_slug":"linux","product_name":"Linux","version_start":"5.12.4","version_start_inclusive":true,"version_end":"5.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.12.4:5.12.*"},{"vendor_slug":"linux","vendor_name":"linux","product_slug":"linux","product_name":"Linux","version_start":"5.13","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.13:*"},{"vendor_slug":"linux","vendor_name":"linux","product_slug":"linux-kernel","product_name":"linux_kernel","version_start":"4.9","version_start_inclusive":true,"version_end":"4.9.269","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2024-02-28T08:13:30.905000Z","label":"CVE 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