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CVE-2026-68387 (GCVE-0-2026-68387)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
Title
can: raw: add locking for raw flags bitfield
Summary
In the Linux kernel, the following vulnerability has been resolved: can: raw: add locking for raw flags bitfield With commit 890e5198a6e5 ("can: raw: use bitfields to store flags in struct raw_sock") the formerly separate integer values have been integrated into a single bitfield. This led to a read-modify-write operation when changing a flag in raw_setsockopt() which now needs a locking to prevent concurrent access. Instead of adding a lock/unlock hell in each of the flag manipulations this patch introduces a wrapper for a new raw_setsockopt_locked() function analogue to the isotp_setsockopt[_locked]() approach in net/can/isotp.c [mkl: use Closes tag instead of Link]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 890e5198a6e5b238627c245fafea1a92670a86cd , < 00ba4bf8798242253fefc1fa6a78db1d445fd024 (git)
Affected: 890e5198a6e5b238627c245fafea1a92670a86cd , < 57791aab1129c9405f84bb0882de58967d8b44cd (git)
Affected: 890e5198a6e5b238627c245fafea1a92670a86cd , < 1e5185c090589f4146d728ab36417d8a5419f127 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "net/can/raw.c"
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              "negate": false,
              "operator": "OR"
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          "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": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "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-\u003ebound. 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\u0027s own memory and security authority, giving standard local privilege escalation rather than crossing a VM, IOMMU, or sandbox boundary.\nC:H - Losing the ro-\u003ebound 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-\u003euniq) into already free_percpu\u0027d 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."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-17T05:04:34.632Z",
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        "shortName": "Linux"
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      ],
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    "datePublished": "2026-08-10T12:04:06.326Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-17T05:04:34.632Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-31T11:45:24+00:00",
      "cve": "CVE-2026-68387",
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      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: can: raw: add locking for raw flags bitfield",
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    "suse_vex": {
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      "current_release_date": "2026-08-13T01:28:01Z",
      "cve": "CVE-2026-68387",
      "id": "CVE-2026-68387",
      "initial_release_date": "2026-08-12T16:22:17Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68387",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68387.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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