CVE-2026-68387

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68387", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.388Z", "datePublished": "2026-08-10T12:04:06.326Z", "dateUpdated": "2026-08-17T05:04:34.632Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:04:34.632Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: raw: add locking for raw flags bitfield\n\nWith commit 890e5198a6e5 (\"can: raw: use bitfields to store flags in\nstruct raw_sock\") the formerly separate integer values have been integrated\ninto a single bitfield. This led to a read-modify-write operation when\nchanging a flag in raw_setsockopt() which now needs a locking to prevent\nconcurrent access.\n\nInstead of adding a lock/unlock hell in each of the flag manipulations this\npatch introduces a wrapper for a new raw_setsockopt_locked() function\nanalogue to the isotp_setsockopt[_locked]() approach in net/can/isotp.c\n\n[mkl: use Closes tag instead of Link]"}], "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 race is driven entirely through local syscalls on an AF_CAN/CAN_RAW socket \u2014 one thread calling bind() while another calls setsockopt(SOL_CAN_RAW, CAN_RAW_LOOPBACK). No network packet is needed to trigger the corruption, so the attack vector is local.\nAC:L - The attacker controls both sides of the race, holding the same fd and issuing concurrent bind()/setsockopt() from two threads it pins itself, and can loop the attempt indefinitely until the unlocked read-modify-write on the shared bitfield word loses the update to ro->bound. No condition lies outside attacker control.\nPR:L - can_create() and raw_proto impose no capability check, so any unprivileged local user can open a CAN_RAW socket; a user namespace (unshare -Urn) additionally lets an unprivileged attacker create a vcan device to bind to, so only basic local user access is required.\nUI:N - The attacker performs every step itself \u2014 creating the socket, binding, and racing setsockopt \u2014 with no victim action or cooperation needed at any point.\nS:U - The corruption stays within the kernel's own memory and security authority, giving standard local privilege escalation rather than crossing a VM, IOMMU, or sandbox boundary.\nC:H - Losing the ro->bound update makes raw_release() skip raw_disable_allfilters(), leaving a receiver entry holding a raw sk pointer that can_rx_register() never refcounted; later frames drive raw_rcv() to read fd_frames, xl_frames, raw_vcid_opts and count out of freed memory, and the resulting UAF lets an attacker groom the freed slab to disclose kernel memory.\nI:H - The same dangling socket gives write primitives: raw_rcv() writes through this_cpu_ptr(ro->uniq) into already free_percpu'd memory and calls sock_queue_rcv_skb() on the freed sock, so a heap-sprayed replacement object yields attacker-influenced writes and control-flow hijack potential.\nA:H - The use-after-free reliably oopses or panics the kernel when CAN frames hit the stale receiver entry, and the clobber also skips netdev_put() (leaking a device reference that hangs unregistration) and can drive can_rx_unregister() into its \"receive list entry not found\" error path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/raw.c"], "versions": [{"version": "890e5198a6e5b238627c245fafea1a92670a86cd", "lessThan": "00ba4bf8798242253fefc1fa6a78db1d445fd024", "status": "affected", "versionType": "git"}, {"version": "890e5198a6e5b238627c245fafea1a92670a86cd", "lessThan": "57791aab1129c9405f84bb0882de58967d8b44cd", "status": "affected", "versionType": "git"}, {"version": "890e5198a6e5b238627c245fafea1a92670a86cd", "lessThan": "1e5185c090589f4146d728ab36417d8a5419f127", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/raw.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "6.18", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/00ba4bf8798242253fefc1fa6a78db1d445fd024"}, {"url": "https://git.kernel.org/stable/c/57791aab1129c9405f84bb0882de58967d8b44cd"}, {"url": "https://git.kernel.org/stable/c/1e5185c090589f4146d728ab36417d8a5419f127"}], "title": "can: raw: add locking for raw flags bitfield", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/can/raw.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "00ba4bf8798242253fefc1fa6a78db1d445fd024", "status": "affected", "version": "890e5198a6e5b238627c245fafea1a92670a86cd", "versionType": "git"}, {"lessThan": "57791aab1129c9405f84bb0882de58967d8b44cd", "status": "affected", "version": "890e5198a6e5b238627c245fafea1a92670a86cd", "versionType": "git"}, {"lessThan": "1e5185c090589f4146d728ab36417d8a5419f127", "status": "affected", "version": "890e5198a6e5b238627c245fafea1a92670a86cd", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/can/raw.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "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: raw: add locking for raw flags bitfield\n\nWith commit 890e5198a6e5 (\"can: raw: use bitfields to store flags in\nstruct raw_sock\") the formerly separate integer values have been integrated\ninto a single bitfield. This led to a read-modify-write operation when\nchanging a flag in raw_setsockopt() which now needs a locking to prevent\nconcurrent access.\n\nInstead of adding a lock/unlock hell in each of the flag manipulations this\npatch introduces a wrapper for a new raw_setsockopt_locked() function\nanalogue to the isotp_setsockopt[_locked]() approach in net/can/isotp.c\n\n[mkl: use Closes tag instead of Link]"}], "id": "CVE-2026-68387", "lastModified": "2026-08-17T06:17:47.277", "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": "2026-08-10T13:20:31.950", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/00ba4bf8798242253fefc1fa6a78db1d445fd024"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1e5185c090589f4146d728ab36417d8a5419f127"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/57791aab1129c9405f84bb0882de58967d8b44cd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: CAN raw socket race condition leads to denial of service.", "id": "2513250", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513250"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-414", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncan: raw: add locking for raw flags bitfield\nWith commit 890e5198a6e5 (\"can: raw: use bitfields to store flags in\nstruct raw_sock\") the formerly separate integer values have been integrated\ninto a single bitfield. This led to a read-modify-write operation when\nchanging a flag in raw_setsockopt() which now needs a locking to prevent\nconcurrent access.\nInstead of adding a lock/unlock hell in each of the flag manipulations this\npatch introduces a wrapper for a new raw_setsockopt_locked() function\nanalogue to the isotp_setsockopt[_locked]() approach in net/can/isotp.c\n[mkl: use Closes tag instead of Link]", "A flaw was found in the Linux kernel's Controller Area Network (CAN) raw socket implementation. A local attacker could exploit a race condition in the `raw_setsockopt()` function. This occurs due to insufficient locking during read-modify-write operations on a shared bitfield when modifying socket flags. Successful exploitation could lead to data corruption or system instability, potentially resulting in a denial of service."], "name": "CVE-2026-68387", "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:04:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68387\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68387\nhttps://git.kernel.org/stable/c/00ba4bf8798242253fefc1fa6a78db1d445fd024\nhttps://git.kernel.org/stable/c/1e5185c090589f4146d728ab36417d8a5419f127\nhttps://git.kernel.org/stable/c/57791aab1129c9405f84bb0882de58967d8b44cd"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[890e5198a6e5b238627c245fafea1a92670a86cd,00ba4bf8798242253fefc1fa6a78db1d445fd024)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[890e5198a6e5b238627c245fafea1a92670a86cd,57791aab1129c9405f84bb0882de58967d8b44cd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[890e5198a6e5b238627c245fafea1a92670a86cd,1e5185c090589f4146d728ab36417d8a5419f127)"}}], "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": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"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": "2026-08-10T16:30:05.109077+00:00", "title": "Race Condition in CAN Raw Socket Flag Handling", "updated": "2026-08-14T01:15:17.093314+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}