{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72231", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.913Z", "datePublished": "2026-08-15T05:54:22.076Z", "dateUpdated": "2026-08-17T05:41:48.586Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:48.586Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: avoid request storms during pending request\n\nbatadv_send_tt_request() allocates a tt_req_node when none exists for the\ndestination originator node. This should prevent that a multiple TT\nrequests are send at the same time to an originator.\n\nBut if allocation of the send buffer failed, this request must be cleaned\nup again. But indicator for such a failure is \"ret == false\". But the\nactual implementation is checking for \"ret == true\".\n\nThe check must be inverted to not loose the information about the TT\nrequest directly after it was attempted to be sent out. This should avoid\npotential request storms." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is reached when remote batman-adv OGM/TVLV packets are received on an active mesh hardif via batadv_batman_skb_recv() → batadv_iv_ogm_recv() → batadv_tvlv_ogm_receive() → batadv_tt_update_orig() → batadv_send_tt_request(), with no local syscall required on the victim.\nAC:L - A mesh attacker can deterministically craft OGMs with mismatched TTVN/CRC to force the request_table path on every received OGM; the inverted ret check removes the pending tt_req_node after each successful send, eliminating deduplication so storms are repeatable without races.\nPR:N - batman-adv OGM/TVLV processing performs no authentication or capability check on senders; any mesh peer that can inject ETH_P_BATMAN frames onto the victim's active hardif triggers the vulnerable path without Linux credentials on the victim host.\nUI:N - No victim user action is required once batman-adv is active; the kernel automatically processes incoming OGMs and issues TT_REQUEST unicasts in response to detected translation-table inconsistency, entirely driven by attacker-supplied mesh traffic.\nS:U - Impact is confined to excessive batman-adv translation-table control traffic and resource exhaustion on the victim mesh node within the kernel networking stack; it does not cross VM, container, IOMMU, or other security authority boundaries.\nC:N - The inverted conditional is a pure logic error in tt_req_node list housekeeping; it causes neither out-of-bounds access, use-after-free, nor uninitialized data transmission, so no information-disclosure or memory-read primitive exists.\nI:N - No attacker-controlled kernel memory writes or data corruption occur; the bug only suppresses pending-request tracking so duplicate TT_REQUEST packets are emitted, flooding mesh bandwidth without modifying stored translation-table contents.\nA:H - Removing the tt_req_node immediately after each successful TT_REQUEST disables the one-request-per-originator guard, letting a remote attacker drive unbounded GFP_ATOMIC allocations and mesh-wide TT_REQUEST storms that can exhaust CPU, memory, and link capacity on community mesh nodes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/translation-table.c" ], "versions": [ { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "6055695ea40c64a47e00742c12c99b1a33b4daed", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "21c44a6895f41df811d1c91d10eea194dda2b345", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "5e46c76d9a5062212c4c5f642a5549fd9c057f8a", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "067e413eec2e63c2996909ef55214b3a0eda0be7", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "716f434eb35869e130424331584a91fbb729b9bd", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "6a65ac8a81e903bb4b555c1d13532f5cb0167a4a", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "aba1cf21954e64c36afb966b754adad2b0b8aa48", "status": "affected", "versionType": "git" }, { "version": "335fbe0f5d2501b7dd815806aef6fd9bad784eb1", "lessThan": "27c7d40008231ae4140d35501b60087a9de2d2c3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/translation-table.c" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6055695ea40c64a47e00742c12c99b1a33b4daed" }, { "url": "https://git.kernel.org/stable/c/21c44a6895f41df811d1c91d10eea194dda2b345" }, { "url": "https://git.kernel.org/stable/c/5e46c76d9a5062212c4c5f642a5549fd9c057f8a" }, { "url": "https://git.kernel.org/stable/c/067e413eec2e63c2996909ef55214b3a0eda0be7" }, { "url": "https://git.kernel.org/stable/c/716f434eb35869e130424331584a91fbb729b9bd" }, { "url": "https://git.kernel.org/stable/c/6a65ac8a81e903bb4b555c1d13532f5cb0167a4a" }, { "url": "https://git.kernel.org/stable/c/aba1cf21954e64c36afb966b754adad2b0b8aa48" }, { "url": "https://git.kernel.org/stable/c/27c7d40008231ae4140d35501b60087a9de2d2c3" } ], "title": "batman-adv: tt: avoid request storms during pending request", "x_generator": { "engine": "bippy-1.2.0" } } } }