{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72119", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.906Z", "datePublished": "2026-08-15T05:52:58.479Z", "dateUpdated": "2026-08-19T16:36:13.917Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:13.917Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: extend bcm_tx_lock usage for data and timer updates\n\nStage new CAN frame content for an existing tx op into a kmalloc()'d\nbuffer and validate it there, mirroring the approach already used in\nbcm_rx_setup(). Only copy the validated data into op->frames while\nholding op->bcm_tx_lock, so bcm_can_tx() and bcm_tx_timeout_handler()\ncan no longer observe a partially updated or unvalidated frame.\n\nAdd a missing error path for memcpy_from_msg() when copying CAN frame\ndata from userspace.\n\nAlso move the kt_ival1/kt_ival2/ival1/ival2 updates in bcm_tx_setup()\nunder op->bcm_tx_lock, and read kt_ival1/kt_ival2/count under the same\nlock in bcm_tx_set_expiry() and bcm_tx_timeout_handler(), closing the\ntorn 64-bit ktime_t read on 32-bit platforms." } ], "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 - The bug is reached only through PF_CAN/CAN_BCM socket sendmsg() TX_SETUP updates racing hrtimer-driven bcm_can_tx(); it is not triggered by remote network services or CAN bus traffic alone.\nAC:L - The attacker controls both sides of the race by creating cyclic TX ops with STARTTIMER/SETTIMER and repeatedly issuing TX_SETUP while the softirq hrtimer fires, making the window reliably winnable without external timing luck.\nPR:L - bcm_sendmsg()/bcm_connect() enforce no capability checks; any local user with access to a CAN interface (including vcan created with CAP_NET_ADMIN inside an unprivileged user namespace) can open BCM sockets and drive TX_SETUP.\nUI:N - Exploitation requires only the attacker opening a BCM socket and sending TX_SETUP messages; no victim interaction such as mounting filesystems or opening files is needed.\nS:U - Impact is confined to kernel memory/state corruption and local privilege effects on the host running CAN BCM; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - Racing updates can let bcm_can_tx() transmit partially updated or unvalidated frames (e.g., len>64) before bcm_tx_setup() rejects them, and many CAN driver xmit paths memcpy(cf->data, cf->len) trusting len, causing kernel out-of-bounds reads.\nI:H - Concurrent unsynchronized writes to op->frames, flags, count, and ktime_t timer fields corrupt shared in-kernel BCM state that directly feeds skb construction and driver transmission, providing attacker-influenced memory corruption primitives.\nA:H - Observing torn/unvalidated frames in bcm_can_tx() during active timers can trigger kernel WARN/Oops/panic via out-of-bounds accesses in CAN drivers, and torn ktime_t/count reads can disrupt cyclic transmission causing denial of service." } ] } ], "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": "7595de7bc56e0e52b74e56c90f7e247bf626d628", "lessThan": "a538b072ee074c9b41b9d9c15a6861a963e30755", "status": "affected", "versionType": "git" }, { "version": "fbd8fdc2b218e979cfe422b139b8f74c12419d1f", "lessThan": "63422347b4c782f429748b2a09cd3cf3b77e6abd", "status": "affected", "versionType": "git" }, { "version": "2a437b86ac5a9893c902f30ef66815bf13587bf6", "lessThan": "37917e432e50b7de2b64230974380132a30f7270", "status": "affected", "versionType": "git" }, { "version": "76c84c3728178b2d38d5604e399dfe8b0752645e", "lessThan": "52f06e7603780de100233713ddaf971d422e10ef", "status": "affected", "versionType": "git" }, { "version": "cc55dd28c20a6611e30596019b3b2f636819a4c0", "lessThan": "972fd66bb08fdef1090abe43196ca8da07216d13", "status": "affected", "versionType": "git" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "lessThan": "bd46f55dec608daa44b45dcf3328517630ad8e40", "status": "affected", "versionType": "git" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "lessThan": "337f966c00662d81ad82cf5a4bbb150b2e32c0d4", "status": "affected", "versionType": "git" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "lessThan": "12ce799f7ab1e05bd8fbf79e46f403bfe5597ebc", "status": "affected", "versionType": "git" }, { "version": "8f1c022541bf5a923c8d6fa483112c15250f30a4", "status": "affected", "versionType": "git" }, { "version": "c4e8a172501e677ebd8ea9d9161d97dc4df56fbd", "status": "affected", "versionType": "git" }, { "version": "5.10.238", "lessThan": "5.10.265", "status": "affected", "versionType": "semver" }, { "version": "5.15.185", "lessThan": "5.15.216", "status": "affected", "versionType": "semver" }, { "version": "6.1.141", "lessThan": "6.1.183", "status": "affected", "versionType": "semver" }, { "version": "6.6.93", "lessThan": "6.6.148", "status": "affected", "versionType": "semver" }, { "version": "6.12.31", "lessThan": "6.12.101", "status": "affected", "versionType": "semver" }, { "version": "5.4.294", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "6.14.9", "lessThan": "6.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/can/bcm.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.10.238", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.185", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.141", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.93", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.31", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.294" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a538b072ee074c9b41b9d9c15a6861a963e30755" }, { "url": "https://git.kernel.org/stable/c/63422347b4c782f429748b2a09cd3cf3b77e6abd" }, { "url": "https://git.kernel.org/stable/c/37917e432e50b7de2b64230974380132a30f7270" }, { "url": "https://git.kernel.org/stable/c/52f06e7603780de100233713ddaf971d422e10ef" }, { "url": "https://git.kernel.org/stable/c/972fd66bb08fdef1090abe43196ca8da07216d13" }, { "url": "https://git.kernel.org/stable/c/bd46f55dec608daa44b45dcf3328517630ad8e40" }, { "url": "https://git.kernel.org/stable/c/337f966c00662d81ad82cf5a4bbb150b2e32c0d4" }, { "url": "https://git.kernel.org/stable/c/12ce799f7ab1e05bd8fbf79e46f403bfe5597ebc" } ], "title": "can: bcm: extend bcm_tx_lock usage for data and timer updates", "x_generator": { "engine": "bippy-1.2.0" } } } }