{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72120", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.907Z", "datePublished": "2026-08-15T05:52:59.226Z", "dateUpdated": "2026-08-17T05:40:33.370Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:40:33.370Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu list annotations and operations\n\nsashiko-bot remarked the missing use of list_add_rcu() in\nbcm_[rx|tx]_setup() to have a proper initialized bcm_op structure\nwhen bcm_proc_show() traverses the bcm_op's under rcu_read_lock().\n\nTo cover all initial settings of the bcm_op's the list_add_rcu() calls\nare moved to the end of the setup code.\n\nWhile at it, also fix the mirroring removal side: bcm_release() called\nbcm_remove_op() - which frees the op via call_rcu() - on ops that were\nstill linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first.\nUnlink each op with list_del_rcu() before handing it to bcm_remove_op(),\nmatching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local syscalls (socket/connect/sendmsg/close on PF_CAN/CAN_BCM) and/or reading /proc/net/can-bcm/<inode>; the bug is in RCU list management and procfs traversal, not in remote CAN frame reception.\nAC:L - The attacker controls both sides of the race\u2014concurrent TX_SETUP/RX_SETUP or socket close while repeatedly reading the world-readable proc entry\u2014so the UAF in bcm_proc_show is reliably triggerable without external timing luck.\nPR:L - PF_CAN CAN_BCM sockets are created and connected without capability checks; RX_SETUP works with ifindex 0 (no bound CAN device), so any unprivileged local user can create ops and race procfs reads on automotive, industrial, and embedded systems with CONFIG_CAN_BCM.\nUI:N - No victim interaction is required; the attacker drives the full exploit sequence (socket setup, opcode installation, proc reads, and socket teardown) from their own local process threads.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is local privilege escalation or crash, not crossing a VM, container, or IOMMU security boundary.\nC:H - bcm_proc_show dereferences bcm_op fields (can_id, flags, timers, counters) from list entries that may already be freed via call_rcu in bcm_remove_op, enabling kernel heap memory disclosure and further exploitation primitives.\nI:H - Freed bcm_op structures are kmalloc heap objects containing list_head links, sock pointers, and hrtimer state; UAF combined with heap spraying can yield arbitrary kernel writes and control-flow hijack for privilege escalation.\nA:H - Concurrent procfs traversal of tx_ops/rx_ops lists containing stale pointers to RCU-freed bcm_op objects can cause kernel oops/panic during list walking or field access, and UAF exploitation attempts can also crash the system."}]}], "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": "659701c0b954ccdb4a916a4ad59bbc16e726d42c", "lessThan": "8357255e56dc1aaa437e3c53ee9385de984e0d57", "status": "affected", "versionType": "git"}, {"version": "0622846db728a5332b917c797c733e202c4620ae", "lessThan": "8e1c7257c81577130f5ce90f69b2a2c3ce63f957", "status": "affected", "versionType": "git"}, {"version": "6d7d458c41b98a5c1670cbd36f2923c37de51cf5", "lessThan": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/can/bcm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8357255e56dc1aaa437e3c53ee9385de984e0d57", "status": "affected", "version": "659701c0b954ccdb4a916a4ad59bbc16e726d42c", "versionType": "git"}, {"lessThan": "8e1c7257c81577130f5ce90f69b2a2c3ce63f957", "status": "affected", "version": "0622846db728a5332b917c797c733e202c4620ae", "versionType": "git"}, {"lessThan": "eb1c26eab4d1f0b4450439b4b88c3e73faf1da98", "status": "affected", "version": "6d7d458c41b98a5c1670cbd36f2923c37de51cf5", "versionType": "git"}, {"lessThan": "f53bdab85e64eb57d6899a30d1307fd5a3639cc7", "status": "affected", "version": "1f912f8484e9c4396378c39460bbea0af681f319", "versionType": "git"}, {"lessThan": "4e22e8b505f877573bbdfdbcb680babad9b2f7a1", "status": "affected", "version": "63567ecd99a24495208dc860d50fb17440043006", "versionType": "git"}, {"lessThan": "b06a4a397ac826603f39875cb7c7819a41365196", "status": "affected", "version": "dac5e6249159ac255dad9781793dbe5908ac9ddb", "versionType": "git"}, {"lessThan": "30f7bb922cb7e7f072a56c7cb7a5efccd2ceca1d", "status": "affected", "version": "dac5e6249159ac255dad9781793dbe5908ac9ddb", "versionType": "git"}, {"lessThan": "7b2c3eabc4dafc062a25e10711154f2107526a78", "status": "affected", "version": "dac5e6249159ac255dad9781793dbe5908ac9ddb", "versionType": "git"}, {"status": "affected", "version": "19f553a1ddf260da6570ed8f8d91a8c87f49b63a", "versionType": "git"}, {"status": "affected", "version": "7c9db92d5f0eadca30884af75c53d601edc512ee", "versionType": "git"}, {"lessThan": "5.10.261", "status": "affected", "version": "5.10.238", "versionType": "semver"}, {"lessThan": "5.15.212", "status": "affected", "version": "5.15.185", "versionType": "semver"}, {"lessThan": "6.1.178", "status": "affected", "version": "6.1.141", "versionType": "semver"}, {"lessThan": "6.6.145", "status": "affected", "version": "6.6.93", "versionType": "semver"}, {"lessThan": "6.12.97", "status": "affected", "version": "6.12.31", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.294", "versionType": "semver"}, {"lessThan": "6.15", "status": "affected", "version": "6.14.9", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/can/bcm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu list annotations and operations\n\nsashiko-bot remarked the missing use of list_add_rcu() in\nbcm_[rx|tx]_setup() to have a proper initialized bcm_op structure\nwhen bcm_proc_show() traverses the bcm_op's under rcu_read_lock().\n\nTo cover all initial settings of the bcm_op's the list_add_rcu() calls\nare moved to the end of the setup code.\n\nWhile at it, also fix the mirroring removal side: bcm_release() called\nbcm_remove_op() - which frees the op via call_rcu() - on ops that were\nstill linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first.\nUnlink each op with list_del_rcu() before handing it to bcm_remove_op(),\nmatching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op()."}], "id": "CVE-2026-72120", "lastModified": "2026-08-17T06:18:11.367", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:26.507", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/30f7bb922cb7e7f072a56c7cb7a5efccd2ceca1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4e22e8b505f877573bbdfdbcb680babad9b2f7a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7b2c3eabc4dafc062a25e10711154f2107526a78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8357255e56dc1aaa437e3c53ee9385de984e0d57"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e1c7257c81577130f5ce90f69b2a2c3ce63f957"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b06a4a397ac826603f39875cb7c7819a41365196"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb1c26eab4d1f0b4450439b4b88c3e73faf1da98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f53bdab85e64eb57d6899a30d1307fd5a3639cc7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: can: bcm: add missing rcu list annotations and operations", "id": "2516582", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516582"}, "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-821", "details": ["A flaw was found in the Linux kernel's `can: bcm` module. Missing Read-Copy-Update (RCU) list annotations and operations can lead to improperly initialized or removed `bcm_op` structures. This improper handling may cause system instability or a denial of service when these structures are accessed."], "name": "CVE-2026-72120", "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": "Out of support scope", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72120\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72120\nhttps://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72120-cbb7@gregkh/T"], "threat_severity": "Moderate"}