{"id":"CVE-2023-53705","state":"PUBLISHED","title":"ipv6: Fix out-of-bounds access in ipv6_find_tlv()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix out-of-bounds access in ipv6_find_tlv()\n\noptlen is fetched without checking whether there is more than one byte to parse.\nIt can lead to out-of-bounds access.\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with SVACE.","publishedAt":"2025-10-22T13:23:42.641Z","updatedAt":"2026-10-15T21:41:33.892Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux 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Fix out-of-bounds access in ipv6_find_tlv()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix out-of-bounds access in ipv6_find_tlv()\n\noptlen is fetched without checking whether there is more than one byte to parse.\nIt can lead to out-of-bounds access.\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with SVACE."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"59e656d0d4a84ea0ee9a39c6f69160a3effccc94","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"04bf69e3de435d793a203aacc4b774f8f9f2baeb","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"011f47c8b8389154f996f5f69da8efc3a3beefef","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"e5f82688ae10f5f386952e65e941bb8868ee54dc","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"9b92e2d0eb696d7586ba832c8854653b59887da0","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"91dd8aab9c9f193210681b86b6b92840ffe74f0c","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"ae68c0f7edbc9a294094ce03a0aaf45aa489ce40","versionType":"git"},{"version":"c61a404325093250b676f40ad8f4dd00f3bcab5f","status":"affected","lessThan":"878ecb0897f4737a4c9401f3523fd49589025671","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/exthdrs_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"4.14.316","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.284","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.244","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.181","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.114","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.31","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.5","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/exthdrs_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/59e656d0d4a84ea0ee9a39c6f69160a3effccc94"},{"url":"https://git.kernel.org/stable/c/04bf69e3de435d793a203aacc4b774f8f9f2baeb"},{"url":"https://git.kernel.org/stable/c/011f47c8b8389154f996f5f69da8efc3a3beefef"},{"url":"https://git.kernel.org/stable/c/e5f82688ae10f5f386952e65e941bb8868ee54dc"},{"url":"https://git.kernel.org/stable/c/9b92e2d0eb696d7586ba832c8854653b59887da0"},{"url":"https://git.kernel.org/stable/c/91dd8aab9c9f193210681b86b6b92840ffe74f0c"},{"url":"https://git.kernel.org/stable/c/ae68c0f7edbc9a294094ce03a0aaf45aa489ce40"},{"url":"https://git.kernel.org/stable/c/878ecb0897f4737a4c9401f3523fd49589025671"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","baseScore":8.2,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - `ipv6_find_tlv()` parses IPv6 extension-header TLV options directly from sk_buff packet data (CALIPSO/MIP6/fragmentation paths), so the malformed option is delivered via a crafted network packet.\nAC:L - The attacker fully controls the extension-header option bytes and can deterministically craft an option layout that leaves a single trailing byte, triggering the out-of-bounds read reliably.\nPR:N - The vulnerable code processes untrusted IPv6 packets in network paths (labeling, MIP6, tunnel/segmentation) that require no authentication; a locally-triggered variant needs only CAP_NET_RAW obtainable via user namespaces, so the higher-severity choice is no privileges.\nUI:N - Parsing of a received/crafted packet's extension headers happens automatically in the kernel with no victim interaction required.\nS:U - The out-of-bounds access stays within the kernel's own memory and does not cross a security/privilege boundary such as a VM or IOMMU domain.\nC:L - A single out-of-bounds byte of adjacent kernel memory is read; it is strictly bounded to one byte and is only used internally in a comparison that always fails, so it is not disclosed back to the attacker.\nI:N - The defect is a read only (`optlen = nh[offset+1]`); no out-of-bounds write or data modification occurs.\nA:H - The out-of-bounds read can fault when the packet buffer abuts an unmapped page (or trip KASAN/panic_on_warn), producing a kernel oops and denial of 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