{"id":"CVE-2023-53669","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix skb_copy_ubufs() vs BIG TCP\n\nDavid Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy\nusing hugepages, and skb length bigger than ~68 KB.\n\nsk…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix skb_copy_ubufs() vs BIG TCP\n\nDavid Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy\nusing hugepages, and skb length bigger than ~68 KB.\n\nsk…","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-401"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.19, < 6.1.29","linux_kernel >= 6.2, < 6.2.16","linux_kernel >= 6.3, < 6.3.3"],"patched":["linux_kernel 6.3.3"],"published":"2025-10-07","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:45.627","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53669","references":[{"url":"https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00156,"epssPercentile":0.04709,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:36:19.702687Z"},"ingestedAt":"2026-10-15T22:48:25.414Z","slug":"CVE-2023-53669","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix skb_copy_ubufs() vs BIG TCP\n\nDavid Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy\nusing hugepages, and skb length bigger than ~68 KB.\n\nskb_copy_ubufs() assumed it could copy all payload using up to\nMAX_SKB_FRAGS order-0 pages.\n\nThis assumption broke when BIG TCP was able to put up to 512 KB per skb.\n\nWe did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45\nand limit gso_max_size to 180000.\n\nA solution is to use higher order pages if needed.\n\nv2: add missing __GFP_COMP, or we leak memory.\n\n## Affected\n\n- `linux_kernel >= 5.19, < 6.1.29`\n- `linux_kernel >= 6.2, < 6.2.16`\n- `linux_kernel >= 6.3, < 6.3.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.3.3`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}