{"api_version":"1","generated_at":"2026-07-24T19:05:00+00:00","cve":"CVE-2026-63834","urls":{"html":"https://cve.report/CVE-2026-63834","api":"https://cve.report/api/cve/CVE-2026-63834.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63834","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63834"},"summary":{"title":"batman-adv: tp_meter: restrict number of unacked list entries","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: restrict number of unacked list entries\n\nWhen the unacked_list is unbound, an attacker could send messages with\nsmall lengths and appropriated seqno + gaps to force the receiver to\nallocate more and more unacked_list entries. And the end either causing an\nout-of-memory situation or increase the management overhead for the (large)\nlist that significant portions of CPU cycles are wasted in searching\nthrough the list.\n\nWhen limiting the list to a specific number, it is important to still\ncorrectly add a new entry to the list. But if the list became larger than\nthe limit, the last entry of the list (with the highest seqno) must be\ndropped to still allow the earlier seqnos to finish and therefore to\ncontinue the process. Otherwise, the process might get stuck with too high\nseqnos which are not handled by batadv_tp_ack_unordered().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 12:16:56","updated_at":"2026-07-19 12:16:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7","name":"https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16","name":"https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013","name":"https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89","name":"https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133","name":"https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68","name":"https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f","name":"https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865","name":"https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63834","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63834","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 31a88792bfba142be3c9521538c1db805677381f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 1111a3381bca2d1f084a07686bc783af5ab23df7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 1c616b0be4bd8399d485e25e91859373b95d6013 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e f8c499fd275e59203b77fca76ae6ef2d096c2133 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.211 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.177 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.144 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.95 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.38 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.3 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63834","cve":"CVE-2026-63834","epss":"0.001650000","percentile":"0.060810000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/tp_meter.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"31a88792bfba142be3c9521538c1db805677381f","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"1111a3381bca2d1f084a07686bc783af5ab23df7","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"1c616b0be4bd8399d485e25e91859373b95d6013","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"f8c499fd275e59203b77fca76ae6ef2d096c2133","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"c6231d628d06d841bc1617b2f7034f5f39876b16","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"2233787658db859f0a9b83cb397cf783bb8be865","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"1fb8762600a393d1caccd63be5d07e1756982d68","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"e7c775110e1858e5a7471a23a9c9658c0af9df89","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/tp_meter.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.8"},{"lessThan":"4.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.260","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.211","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.177","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.144","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.38","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.260","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.211","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.177","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.144","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.38","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.3","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"4.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: restrict number of unacked list entries\n\nWhen the unacked_list is unbound, an attacker could send messages with\nsmall lengths and appropriated seqno + gaps to force the receiver to\nallocate more and more unacked_list entries. And the end either causing an\nout-of-memory situation or increase the management overhead for the (large)\nlist that significant portions of CPU cycles are wasted in searching\nthrough the list.\n\nWhen limiting the list to a specific number, it is important to still\ncorrectly add a new entry to the list. But if the list became larger than\nthe limit, the last entry of the list (with the highest seqno) must be\ndropped to still allow the earlier seqnos to finish and therefore to\ncontinue the process. Otherwise, the process might get stuck with too high\nseqnos which are not handled by batadv_tp_ack_unordered()."}],"providerMetadata":{"dateUpdated":"2026-07-19T12:02:26.045Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f"},{"url":"https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7"},{"url":"https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013"},{"url":"https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133"},{"url":"https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16"},{"url":"https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865"},{"url":"https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68"},{"url":"https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89"}],"title":"batman-adv: tp_meter: restrict number of unacked list entries","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63834","datePublished":"2026-07-19T12:02:26.045Z","dateReserved":"2026-07-19T07:54:57.015Z","dateUpdated":"2026-07-19T12:02:26.045Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 12:16:56","lastModifiedDate":"2026-07-19 12:16:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63834","Ordinal":"1","Title":"batman-adv: tp_meter: restrict number of unacked list entries","CVE":"CVE-2026-63834","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63834","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: restrict number of unacked list entries\n\nWhen the unacked_list is unbound, an attacker could send messages with\nsmall lengths and appropriated seqno + gaps to force the receiver to\nallocate more and more unacked_list entries. And the end either causing an\nout-of-memory situation or increase the management overhead for the (large)\nlist that significant portions of CPU cycles are wasted in searching\nthrough the list.\n\nWhen limiting the list to a specific number, it is important to still\ncorrectly add a new entry to the list. But if the list became larger than\nthe limit, the last entry of the list (with the highest seqno) must be\ndropped to still allow the earlier seqnos to finish and therefore to\ncontinue the process. Otherwise, the process might get stuck with too high\nseqnos which are not handled by batadv_tp_ack_unordered().","Type":"Description","Title":"batman-adv: tp_meter: restrict number of unacked list entries"}]}}}