{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64093", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:40:01.172Z", "dateUpdated": "2026-08-05T12:39:08.305Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:08.305Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: directly shut down timer on cleanup\n\nbatadv_tp_sender_cleanup() was calling timer_delete_sync() followed by\ntimer_delete() to guard against the timer handler re-arming itself between\nthe two calls. This double-deletion hack relied on the sending status being\nset to 0 to suppress re-arming.\n\nReplace both calls with a single timer_shutdown_sync(). This function both\nwaits for any running timer callback to complete (like timer_delete_sync())\nand permanently disarms the timer so it cannot be re-armed afterwards,\nmaking re-arming prevention unconditional and self-documenting.\n\nThe re-arming property is also required because otherwise:\n\n1. context 0 (batadv_tp_recv_ack()) checks in\n batadv_tp_reset_sender_timer() if sending is still 1 -> it is\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\n this process forces the kthread to stop timer in\n batadv_tp_sender_cleanup()\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\n timer -> but the reference for it is already gone" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The bug is triggered in batadv_tp_recv_ack() when forged or legitimate BATADV_TP_ACK mesh packets are received on a batman-adv hard interface; exploitation requires membership on the same batman-adv mesh (shared WiFi/ethernet logical network), which is Adjacent under CVSS and kernel WiFi guidance.\nAC:L - This is a race between batadv_tp_recv_ack()/batadv_tp_reset_sender_timer() and batadv_tp_sender_cleanup(); an adjacent mesh attacker controls ACK timing and can flood packets to reliably hit the window between timer_delete_sync() and timer_delete() while the session tears down.\nPR:N - The vulnerable receive path has no capability or authentication checks; any mesh peer can send TP ACK packets matching an active session without CAP_NET_ADMIN or other privileges on the victim (session start via netlink is a victim-side precondition, not attacker privilege).\nUI:N - Exploitation requires only attacker-timed mesh packets during session teardown; no victim end-user action (opening files, clicking links, etc.) is needed beyond normal mesh operation.\nS:U - Impact is a kernel heap use-after-free in batman-adv with potential privilege escalation; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Re-arming mod_timer() on a freed batadv_tp_vars after batadv_tp_vars_put() is a classic use-after-free; the attacker can influence freed heap contents and obtain arbitrary kernel memory read primitives.\nI:H - The UAF corrupts timer_list and adjacent kmalloc object fields; combined with heap grooming this enables arbitrary kernel writes and control-flow hijacking, not merely a bounded modification.\nA:H - When the re-armed timer fires on freed memory, batadv_tp_sender_timeout() dereferences stale tp_vars pointers, causing kernel oops/panic and reliable remote denial of service even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/tp_meter.c" ], "versions": [ { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "74a76634055462833446684fd526d73c290ea43a", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "5bc2d50fb66b46f86543d5153a188eb1486d0b6e", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "f86b20ec8d17d77bddc02c5c86cfa2389d84ecff", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "770bf0a35f0620b526fd4193889d1e77084e4c43", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "933880a8bc9b4042223a79255c0b1021cdc36991", "status": "affected", "versionType": "git" }, { "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "d5487249a81ea658717614009c8f46acc5b7101a", "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/tp_meter.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.8", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c" }, { "url": "https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a" }, { "url": "https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e" }, { "url": "https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff" }, { "url": "https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43" }, { "url": "https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991" }, { "url": "https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a" } ], "title": "batman-adv: tp_meter: directly shut down timer on cleanup", "x_generator": { "engine": "bippy-1.2.0" } } } }