{"id":"CVE-2026-52916","state":"PUBLISHED","title":"batman-adv: frag: disallow unicast fragment in fragment","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: frag: disallow unicast fragment in fragment\n\nbatadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a\nBATADV_UNICAST_FRAG packet is received. Once all fragments are collected\nand the packet is reassembled, batadv_recv_frag_packet() calls\nbatadv_batman_skb_recv() again to process the defragmented payload.\n\nA malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled\npayload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).\nEach nesting level recurses through batadv_batman_skb_recv() without bound,\ngrowing the kernel stack until it is exhausted.\n\nSince refragmentation or fragments in fragments are not actually allowed,\ndiscard all packets which are still BATADV_UNICAST_FRAG packets after the\ndefragmentation process.","publishedAt":"2026-06-24T07:14:13.221Z","updatedAt":"2026-06-24T07:14:13.221Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"0c208fa3859e3a33a1c38bebc41d021166e94ac8","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"bcda4814dc6524283c0b958882cb963d75fe411d","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"aea54d0bbe156d5ab7d00d68f66149ff41f4612a","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"b54e459cf86943583c1aa2ee3081874e7ab1f5f3","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"5418be6c2e117bf8a316582795a8e3ff90f45e5d","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"5895ad21c7059a652da83fb817510f7a1e962abf","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"7138c35c9ad39a2fca6264af6b87466471f04ffc","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"bc62216dc8e221e3781afa14430f45208bfa9af9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/fragmentation.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/fragmentation.c"]}],"references":["https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8","https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d","https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a","https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3","https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d","https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf","https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc","https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52916.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52916","state":"PUBLISHED","datePublished":"2026-06-24T07:14:13.221Z","dateUpdated":"2026-06-24T07:14:13.221Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.367Z"},"containers":{"cna":{"title":"batman-adv: frag: disallow unicast fragment in fragment","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: frag: disallow unicast fragment in fragment\n\nbatadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a\nBATADV_UNICAST_FRAG packet is received. Once all fragments are collected\nand the packet is reassembled, batadv_recv_frag_packet() calls\nbatadv_batman_skb_recv() again to process the defragmented payload.\n\nA malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled\npayload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).\nEach nesting level recurses through batadv_batman_skb_recv() without bound,\ngrowing the kernel stack until it is exhausted.\n\nSince refragmentation or fragments in fragments are not actually allowed,\ndiscard all packets which are still BATADV_UNICAST_FRAG packets after the\ndefragmentation process."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"0c208fa3859e3a33a1c38bebc41d021166e94ac8","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"bcda4814dc6524283c0b958882cb963d75fe411d","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"aea54d0bbe156d5ab7d00d68f66149ff41f4612a","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"b54e459cf86943583c1aa2ee3081874e7ab1f5f3","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"5418be6c2e117bf8a316582795a8e3ff90f45e5d","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"5895ad21c7059a652da83fb817510f7a1e962abf","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"7138c35c9ad39a2fca6264af6b87466471f04ffc","versionType":"git"},{"version":"610bfc6bc99bc83680d190ebc69359a05fc7f605","status":"affected","lessThan":"bc62216dc8e221e3781afa14430f45208bfa9af9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/fragmentation.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/fragmentation.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8"},{"url":"https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d"},{"url":"https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a"},{"url":"https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3"},{"url":"https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d"},{"url":"https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf"},{"url":"https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc"},{"url":"https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-24T07:14:13.221Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}