cve-2021-47013
Vulnerability from cvelistv5
Published
2024-02-28 08:13
Modified
2024-12-19 07:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 4.9
Show details on NVD website


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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47013\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-28T09:15:38.800\",\"lastModified\":\"2024-12-09T17:59:07.173\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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-\u003elen by netdev_sent_queue(,skb-\u003elen).\\n\\nAs i observed that emac_tx_fill_tpd() haven\u0027t modified the value of skb-\u003elen,\\nthus my patch assigns skb-\u003elen to \u0027len\u0027 before the possible free and\\nuse \u0027len\u0027 instead of skb-\u003elen later.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:emac/emac-mac: Se corrige un uso after free en emac_mac_tx_buf_send En emac_mac_tx_buf_send, llama a emac_tx_fill_tpd(..,skb,..). Si ocurre alg\u00fan error en emac_tx_fill_tpd(), el skb se liberar\u00e1 mediante dev_kfree_skb(skb) en la rama de error de emac_tx_fill_tpd(). Pero el skb liberado todav\u00eda se usa a trav\u00e9s de skb-\u0026gt;len por netdev_sent_queue(,skb-\u0026gt;len). Como observ\u00e9 que emac_tx_fill_tpd() no ha modificado el valor de skb-\u0026gt;len, por lo tanto mi parche asigna skb-\u0026gt;len a \u0027len\u0027 antes del posible free y usa \u0027len\u0027 en lugar de skb-\u0026gt;len m\u00e1s tarde.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9\",\"versionEndExcluding\":\"4.9.269\",\"matchCriteriaId\":\"5330E43C-47EE-40CA-B1A9-C1AAC143732E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.233\",\"matchCriteriaId\":\"4836AF17-022D-49D0-9A8A-AF66FE8DCEB8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.191\",\"matchCriteriaId\":\"5B6E6817-19A8-4C0A-8807-71DA48CF9191\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.119\",\"matchCriteriaId\":\"E07BA880-1043-4674-AC45-266B3B4A44C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.37\",\"matchCriteriaId\":\"7A4CF5D6-ACBA-4980-ABFD-3D7A53B5BB4E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.11.21\",\"matchCriteriaId\":\"8CBB94EC-EC33-4464-99C5-03E5542715F0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.4\",\"matchCriteriaId\":\"D8C7052F-1B7B-4327-9C2B-84EBF3243838\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}"
  }
}


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