243 lines
13 KiB
JSON
243 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64093",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.032Z",
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"datePublished": "2026-07-19T15:40:01.172Z",
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"dateUpdated": "2026-08-05T12:39:08.305Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:08.305Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/tp_meter.c"
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],
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"versions": [
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "74a76634055462833446684fd526d73c290ea43a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "5bc2d50fb66b46f86543d5153a188eb1486d0b6e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "f86b20ec8d17d77bddc02c5c86cfa2389d84ecff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "770bf0a35f0620b526fd4193889d1e77084e4c43",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "933880a8bc9b4042223a79255c0b1021cdc36991",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
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"lessThan": "d5487249a81ea658717614009c8f46acc5b7101a",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/tp_meter.c"
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],
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"versions": [
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{
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"version": "4.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.93",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "5.15.210"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.1.176"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.6.143"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.12.93"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.8",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c"
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},
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{
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"url": "https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a"
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},
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{
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"url": "https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff"
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},
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{
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"url": "https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43"
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},
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{
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"url": "https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991"
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},
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{
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"url": "https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a"
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}
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],
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"title": "batman-adv: tp_meter: directly shut down timer on cleanup",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |