{"id":"CVE-2021-46998","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens,…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.16, < 4.19.191","linux_kernel >= 4.20, < 5.4.120","linux_kernel >= 5.5, < 5.10.38","linux_kernel >= 5.11, < 5.11.22","linux_kernel >= 5.12, < 5.12.5"],"patched":["linux_kernel 5.12.5"],"published":"2024-02-28","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-46998","references":[{"url":"https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00242,"epssPercentile":0.13691,"ingestedAt":"2026-08-04T10:39:38.971Z","slug":"CVE-2021-46998","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\n\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961.\n\n## Affected\n\n- `linux_kernel >= 4.16, < 4.19.191`\n- `linux_kernel >= 4.20, < 5.4.120`\n- `linux_kernel >= 5.5, < 5.10.38`\n- `linux_kernel >= 5.11, < 5.11.22`\n- `linux_kernel >= 5.12, < 5.12.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.12.5`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}