CVE-2026-72118

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The rx variant runs under bcm_rx_update_lock to prevent\nraces when resetting the two rx counters; the tx variant runs under\nbcm_tx_lock and only needs to guard its own counter's overflow.\n\nAs the rx path resets its values already at LONG_MAX / 100, there is\nno conflict between the two locking domains (bcm_rx_update_lock vs.\nbcm_tx_lock) even for ops that use both paths.\n\nThe rx statistics update and the frames_filtered update in\nbcm_rx_changed() were previously performed in two separate\nbcm_rx_update_lock sections. For an rx op subscribed on all interfaces\n(ifindex == 0), bcm_rx_handler() can run concurrently on different\nCPUs, so a counter reset by one CPU between these two sections could\nleave frames_filtered larger than frames_abs on another CPU, producing\na bogus (even negative) reduction percentage in procfs. Update the\nstatistics in the same critical section as bcm_rx_changed() to close\nthis gap, which also removes the now unneeded extra lock/unlock pair\naround the traffic_flags calculation."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/bcm.c"], "versions": [{"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "640acf3566fc897065127001be875ebc5401c218", "status": "affected", "versionType": "git"}, {"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "47fca0d1620f2d4fab0677564989ef2b9c225c66", "status": "affected", "versionType": "git"}, {"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "fd75884eae40a7be47867cbfc9fc84a80bb8ddb4", "status": "affected", "versionType": "git"}, {"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "8b2783172d92edd650de6006ebd1c800937021ab", "status": 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The rx variant runs under bcm_rx_update_lock to prevent\nraces when resetting the two rx counters; the tx variant runs under\nbcm_tx_lock and only needs to guard its own counter's overflow.\n\nAs the rx path resets its values already at LONG_MAX / 100, there is\nno conflict between the two locking domains (bcm_rx_update_lock vs.\nbcm_tx_lock) even for ops that use both paths.\n\nThe rx statistics update and the frames_filtered update in\nbcm_rx_changed() were previously performed in two separate\nbcm_rx_update_lock sections. For an rx op subscribed on all interfaces\n(ifindex == 0), bcm_rx_handler() can run concurrently on different\nCPUs, so a counter reset by one CPU between these two sections could\nleave frames_filtered larger than frames_abs on another CPU, producing\na bogus (even negative) reduction percentage in procfs. Update the\nstatistics in the same critical section as bcm_rx_changed() to close\nthis gap, which also removes the now unneeded extra lock/unlock pair\naround the traffic_flags calculation."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "2.6.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.25"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:11.603Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72118", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:55:20.643Z", "dateReserved": "2026-08-09T03:40:39.906Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:52:57.734Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The rx variant runs under bcm_rx_update_lock to prevent\nraces when resetting the two rx counters; the tx variant runs under\nbcm_tx_lock and only needs to guard its own counter's overflow.\n\nAs the rx path resets its values already at LONG_MAX / 100, there is\nno conflict between the two locking domains (bcm_rx_update_lock vs.\nbcm_tx_lock) even for ops that use both paths.\n\nThe rx statistics update and the frames_filtered update in\nbcm_rx_changed() were previously performed in two separate\nbcm_rx_update_lock sections. For an rx op subscribed on all interfaces\n(ifindex == 0), bcm_rx_handler() can run concurrently on different\nCPUs, so a counter reset by one CPU between these two sections could\nleave frames_filtered larger than frames_abs on another CPU, producing\na bogus (even negative) reduction percentage in procfs. Update the\nstatistics in the same critical section as bcm_rx_changed() to close\nthis gap, which also removes the now unneeded extra lock/unlock pair\naround the traffic_flags calculation."}], "id": "CVE-2026-72118", "lastModified": "2026-11-06T17:19:37.677", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72118", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:51:50.243557Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:26.240", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47fca0d1620f2d4fab0677564989ef2b9c225c66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/640acf3566fc897065127001be875ebc5401c218"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8104bcdb2612fdda95169ddc3b49747b2ff98d24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b2783172d92edd650de6006ebd1c800937021ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/970caff5c1a63702c80e08d920256bcb5f88ecc5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df47f07cdc801a6afe05a486b5a343c3e532a93c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd75884eae40a7be47867cbfc9fc84a80bb8ddb4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: can: bcm: fix CAN frame rx/tx statistics", "id": "2516444", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516444"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's Controller Area Network (CAN) Broadcast Manager (BCM) module. A data race condition, occurring when multiple central processing units (CPUs) simultaneously process CAN frames, can lead to incorrect statistics being reported. This could result in a bogus or negative reduction percentage in the system's process file system (procfs), potentially affecting system monitoring and integrity."], "name": "CVE-2026-72118", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72118\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72118\nhttps://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72118-15a1@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ffd980f976e7fd666c2e61bf8ab35107efd11828,8b2783172d92edd650de6006ebd1c800937021ab)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ffd980f976e7fd666c2e61bf8ab35107efd11828,970caff5c1a63702c80e08d920256bcb5f88ecc5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ffd980f976e7fd666c2e61bf8ab35107efd11828,8104bcdb2612fdda95169ddc3b49747b2ff98d24)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ffd980f976e7fd666c2e61bf8ab35107efd11828,df47f07cdc801a6afe05a486b5a343c3e532a93c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ffd980f976e7fd666c2e61bf8ab35107efd11828,e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.25"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,2.6.25)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T09:00:06.792567+00:00", "title": "Data Race in Linux Kernel CAN BCM Driver Leads to Incorrect Traffic Statistics", "updated": "2026-08-18T04:45:04.399790+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}