CVE-2026-64092

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64092", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:40:00.603Z", "dateUpdated": "2026-07-19T15:40:00.603Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:00.603Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown\n\nThe receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is\nresponsible for releasing the tp_vars reference it holds. However, the\nexisting logic for coordinating this release with batadv_tp_stop_all() was\nflawed.\n\ntimer_shutdown_sync() guarantees the timer will not fire again after it\nreturns, but it returns non-zero only when the timer was pending at the\ntime of the call. If the timer had already expired (and\nbatadv_tp_stop_all() would unsucessfully try to rearm itself),\nbatadv_tp_stop_all() skips its batadv_tp_vars_put(), and\nbatadv_tp_receiver_shutdown() fails to put its own reference as well.\n\nFix this by introducing a new atomic variable receiving that is set to 1\nwhen the receiver is initialized and cleared atomically with atomic_xchg()\nby whichever side claims it first. Only the side that observes the\ntransition from 1 to 0 is responsible for releasing the tp_vars timer\nreference, eliminating the uncertainty."}], "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", "net/batman-adv/types.h"], "versions": [{"version": "268078acae72daa12b17b2b299701cb9924e469a", "lessThan": "7715c73f33260af724d734c41b794457e9be8dbc", "status": "affected", "versionType": "git"}, {"version": "58943b7ea356294749dae3e75b96c0ee292c00be", "lessThan": "297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae", "status": "affected", "versionType": "git"}, {"version": "79bc0eaeef2c5797317bf2da8e3159a74d62ec47", "lessThan": "0b1bedf114ea93fef929b31f0d70a9eedcc601de", "status": "affected", "versionType": "git"}, {"version": "26dfeee8db81354bfdade155f27f9e16510ad196", "lessThan": "a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0", "status": "affected", "versionType": "git"}, {"version": "03660dab86f93319178a24667f6998526dc4355d", "lessThan": "b285bc0a97f43823a4967fb6d286de4c7f53d541", "status": "affected", "versionType": "git"}, {"version": "8634c1dbd73adb74d40533ebb7e914efb82e71fb", "lessThan": "d078501dde9b57210f1808cdef4b59463d1f5fc8", "status": "affected", "versionType": "git"}, {"version": "3d3cf6a7314aca4df0a6dde28ce784a2a30d0166", "lessThan": "77098e4bea37af51d3962efa88a5af2ea5e1ac57", "status": "affected", "versionType": "git"}, {"version": "5e7d0ac936354c36810e74ac3056b334ed1f4058", "status": "affected", "versionType": "git"}, {"version": "5.10.259", "lessThan": "5.11", "status": "affected", "versionType": "semver"}]}, {"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", "net/batman-adv/types.h"], "versions": [{"version": "6.6.140", "lessThan": "6.6.142", "status": "affected", "versionType": "semver"}, {"version": "6.12.90", "lessThan": "6.12.92", "status": "affected", "versionType": "semver"}, {"version": "6.18.32", "lessThan": "6.18.34", "status": "affected", "versionType": "semver"}, {"version": "7.0.9", "lessThan": "7.0.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.140", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.90", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.32", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.9", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.259"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7715c73f33260af724d734c41b794457e9be8dbc"}, {"url": "https://git.kernel.org/stable/c/297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae"}, {"url": "https://git.kernel.org/stable/c/0b1bedf114ea93fef929b31f0d70a9eedcc601de"}, {"url": "https://git.kernel.org/stable/c/a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0"}, {"url": "https://git.kernel.org/stable/c/b285bc0a97f43823a4967fb6d286de4c7f53d541"}, {"url": "https://git.kernel.org/stable/c/d078501dde9b57210f1808cdef4b59463d1f5fc8"}, {"url": "https://git.kernel.org/stable/c/77098e4bea37af51d3962efa88a5af2ea5e1ac57"}], "title": "batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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However, the\nexisting logic for coordinating this release with batadv_tp_stop_all() was\nflawed.\n\ntimer_shutdown_sync() guarantees the timer will not fire again after it\nreturns, but it returns non-zero only when the timer was pending at the\ntime of the call. If the timer had already expired (and\nbatadv_tp_stop_all() would unsucessfully try to rearm itself),\nbatadv_tp_stop_all() skips its batadv_tp_vars_put(), and\nbatadv_tp_receiver_shutdown() fails to put its own reference as well.\n\nFix this by introducing a new atomic variable receiving that is set to 1\nwhen the receiver is initialized and cleared atomically with atomic_xchg()\nby whichever side claims it first. Only the side that observes the\ntransition from 1 to 0 is responsible for releasing the tp_vars timer\nreference, eliminating the uncertainty."}], "id": "CVE-2026-64092", "lastModified": "2026-08-11T15:56:10.913", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-07-19T16:17:50.110", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0b1bedf114ea93fef929b31f0d70a9eedcc601de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/297e1bc4a915b7cd3e65a79ed906b23fb3d7aaae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77098e4bea37af51d3962efa88a5af2ea5e1ac57"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7715c73f33260af724d734c41b794457e9be8dbc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a9f0bfd624ee8a286d6fd2bf0f796e730efb49b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b285bc0a97f43823a4967fb6d286de4c7f53d541"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d078501dde9b57210f1808cdef4b59463d1f5fc8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown", "id": "2502555", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502555"}, "csaw": false, "cwe": "CWE-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbatman-adv: tp_meter: fix tp_vars reference leak in receiver shutdown\nThe receiver shutdown timer handler, batadv_tp_receiver_shutdown(), is\nresponsible for releasing the tp_vars reference it holds. However, the\nexisting logic for coordinating this release with batadv_tp_stop_all() was\nflawed.\ntimer_shutdown_sync() guarantees the timer will not fire again after it\nreturns, but it returns non-zero only when the timer was pending at the\ntime of the call. If the timer had already expired (and\nbatadv_tp_stop_all() would unsucessfully try to rearm itself),\nbatadv_tp_stop_all() skips its batadv_tp_vars_put(), and\nbatadv_tp_receiver_shutdown() fails to put its own reference as well.\nFix this by introducing a new atomic variable receiving that is set to 1\nwhen the receiver is initialized and cleared atomically with atomic_xchg()\nby whichever side claims it first. Only the side that observes the\ntransition from 1 to 0 is responsible for releasing the tp_vars timer\nreference, eliminating the uncertainty.", "A flaw was found in the Linux kernel's batman-adv module, specifically within the tp_meter component. The batadv_tp_receiver_shutdown() function, responsible for releasing tp_vars references, contains flawed logic for coordinating this release during receiver shutdown. This can lead to a reference leak, potentially impacting system stability or resource availability."], "name": "CVE-2026-64092", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64092\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64092\nhttps://lore.kernel.org/linux-cve-announce/2026071918-CVE-2026-64092-670e@gregkh/T"]}

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