CVE-2026-72121 (GCVE-0-2026-72121)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:36
VLAI
Title
can: bcm: add locking when updating filter and timer values
Summary
In the Linux kernel, the following vulnerability has been resolved: can: bcm: add locking when updating filter and timer values KCSAN detected a simultaneous access to timer values that can be overwritten in bcm_rx_setup() when updating timer and filter content while bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler() run concurrently on incoming CAN traffic. Protect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter (nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new per-op bcm_rx_update_lock, taken with the matching scope in the RX handlers. memcpy_from_msg() is staged into a temporary buffer before the lock is taken, since it can sleep and must not run under a spinlock. hrtimer_cancel() is always called without bcm_rx_update_lock held, since bcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a running callback would otherwise deadlock against the canceller. Also close a related race: bcm_rx_setup() cleared the RTR flag in the stored reply frame's can_id as a separate, unprotected step after the frame content was already installed, so a concurrent bcm_rx_handler() could transmit a stale reply with CAN_RTR_FLAG still set. Fold that normalization into the initial frame preparation instead (on the staged buffer for updates, directly on op->frames pre-registration for new ops), so the installed frame is always atomically self-consistent. bcm_rx_handler()'s RX_RTR_FRAME check now takes a lock-protected snapshot of op->flags before deciding whether to call bcm_can_tx(), but does not hold the lock across that call. Also take a lock-protected snapshot of the currframe in bcm_can_tx() to avoid partly overwrites by content updates in bcm_tx_setup(). Finally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset op->currframe between the two locked sections in bcm_can_tx(). Omit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler(). kt_ival2 may have been concurrently cleared by bcm_rx_setup() before it cancels this timer, so check kt_ival2 inside the bcm_rx_update_lock.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7595de7bc56e0e52b74e56c90f7e247bf626d628 , < 96994180bd7b248b0cc698afe926e23fc1bda59b (git)
Affected: fbd8fdc2b218e979cfe422b139b8f74c12419d1f , < caa8704a7f3cb7806331596195385437126ecb3a (git)
Affected: 2a437b86ac5a9893c902f30ef66815bf13587bf6 , < a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658 (git)
Affected: 76c84c3728178b2d38d5604e399dfe8b0752645e , < a7eb6db1cd3f7b556a301dc1265945ad112089f7 (git)
Affected: cc55dd28c20a6611e30596019b3b2f636819a4c0 , < 834cbca3b12e46887f7a9b35f1981a888360ea4c (git)
Affected: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 , < 19b1994069dd29478ba767de1f98f14a088198dc (git)
Affected: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 , < fc9f5ee1b073bd233d9c604e338af4ebb42cbc33 (git)
Affected: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 , < 749179c2e25b95d22499ed29096b3e02d6dfd2b4 (git)
Affected: 8f1c022541bf5a923c8d6fa483112c15250f30a4 (git)
Affected: c4e8a172501e677ebd8ea9d9161d97dc4df56fbd (git)
Affected: 5.10.238 , < 5.10.265 (semver)
Affected: 5.15.185 , < 5.15.216 (semver)
Affected: 6.1.141 , < 6.1.183 (semver)
Affected: 6.6.93 , < 6.6.148 (semver)
Affected: 6.12.31 , < 6.12.101 (semver)
Affected: 5.4.294 , < 5.5 (semver)
Affected: 6.14.9 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add locking when updating filter and timer values\n\nKCSAN detected a simultaneous access to timer values that can be\noverwritten in bcm_rx_setup() when updating timer and filter content\nwhile bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler()\nrun concurrently on incoming CAN traffic.\n\nProtect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter\n(nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new\nper-op bcm_rx_update_lock, taken with the matching scope in the RX\nhandlers. memcpy_from_msg() is staged into a temporary buffer before the\nlock is taken, since it can sleep and must not run under a spinlock.\n\nhrtimer_cancel() is always called without bcm_rx_update_lock held, since\nbcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a\nrunning callback would otherwise deadlock against the canceller.\n\nAlso close a related race: bcm_rx_setup() cleared the RTR flag in the\nstored reply frame\u0027s can_id as a separate, unprotected step after the\nframe content was already installed, so a concurrent bcm_rx_handler()\ncould transmit a stale reply with CAN_RTR_FLAG still set. Fold that\nnormalization into the initial frame preparation instead (on the staged\nbuffer for updates, directly on op-\u003eframes pre-registration for new\nops), so the installed frame is always atomically self-consistent.\n\nbcm_rx_handler()\u0027s RX_RTR_FRAME check now takes a lock-protected\nsnapshot of op-\u003eflags before deciding whether to call bcm_can_tx(),\nbut does not hold the lock across that call.\n\nAlso take a lock-protected snapshot of the currframe in bcm_can_tx()\nto avoid partly overwrites by content updates in bcm_tx_setup().\nFinally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset\nop-\u003ecurrframe between the two locked sections in bcm_can_tx().\n\nOmit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler().\nkt_ival2 may have been concurrently cleared by bcm_rx_setup() before it\ncancels this timer, so check kt_ival2 inside the bcm_rx_update_lock."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:A - The race is driven by concurrent CAN frame reception in bcm_rx_handler()/timer callbacks on a shared CAN segment (automotive OBD/ECU bus, factory controllers, CAN-USB adapters), an adjacent broadcast medium comparable to Bluetooth/WiFi segment access.\nAC:L - An attacker controls both race sides by flooding RX_SETUP via sendmsg while concurrently injecting matching CAN frames or armed timers; syzbot reliably reproduced the KCSAN race without timing conditions beyond attacker control.\nPR:N - CAN_BCM sockets impose no capability checks in can_create()/bcm_sendmsg(), and a bus participant can trigger the RX handler path without any Linux credentials while racing BCM configuration updates from local services.\nUI:N - Exploitation requires no victim interaction beyond normal background CAN/BCM activity on systems that already use the Broadcast Manager for monitoring or diagnostics.\nS:U - Impact is confined to kernel memory corruption and privilege boundaries within the same host; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Unlocked concurrent updates to nframes/flags/frames/last_frames permit torn reads and out-of-bounds accesses in handler loops and timeout memset, matching the prior BCM race class that produced KASAN slab-out-of-bounds reads.\nI:H - Partial overwrites of op-\u003eframes during bcm_can_tx(), stale RTR replies transmitted on the bus, and size-mismatched memset/memcpy against concurrently shrinking buffers enable arbitrary CAN injection and kernel heap corruption.\nA:H - Concurrent timer corruption (hrtimer_forward with zero kt_ival2), torn structure fields, and heap corruption from racing memset/copy operations can cause kernel oops, panic, or sustained denial of service on CAN-equipped systems."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:36:16.520Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/96994180bd7b248b0cc698afe926e23fc1bda59b"
        },
        {
          "url": "https://git.kernel.org/stable/c/caa8704a7f3cb7806331596195385437126ecb3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7eb6db1cd3f7b556a301dc1265945ad112089f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/834cbca3b12e46887f7a9b35f1981a888360ea4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/19b1994069dd29478ba767de1f98f14a088198dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc9f5ee1b073bd233d9c604e338af4ebb42cbc33"
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        {
          "url": "https://git.kernel.org/stable/c/749179c2e25b95d22499ed29096b3e02d6dfd2b4"
        }
      ],
      "title": "can: bcm: add locking when updating filter and timer values",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72121",
    "datePublished": "2026-08-15T05:52:59.959Z",
    "dateReserved": "2026-08-09T03:40:39.907Z",
    "dateUpdated": "2026-08-19T16:36:16.520Z",
    "state": "PUBLISHED"
  },
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      "cve": "CVE-2026-72121",
      "date": "2026-08-24",
      "epss": "0.00345",
      "percentile": "0.27005"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72121\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:21:26.650\",\"lastModified\":\"2026-08-19T17:20:59.160\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncan: bcm: add locking when updating filter and timer values\\n\\nKCSAN detected a simultaneous access to timer values that can be\\noverwritten in bcm_rx_setup() when updating timer and filter content\\nwhile bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler()\\nrun concurrently on incoming CAN traffic.\\n\\nProtect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter\\n(nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new\\nper-op bcm_rx_update_lock, taken with the matching scope in the RX\\nhandlers. memcpy_from_msg() is staged into a temporary buffer before the\\nlock is taken, since it can sleep and must not run under a spinlock.\\n\\nhrtimer_cancel() is always called without bcm_rx_update_lock held, since\\nbcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a\\nrunning callback would otherwise deadlock against the canceller.\\n\\nAlso close a related race: bcm_rx_setup() cleared the RTR flag in the\\nstored reply frame\u0027s can_id as a separate, unprotected step after the\\nframe content was already installed, so a concurrent bcm_rx_handler()\\ncould transmit a stale reply with CAN_RTR_FLAG still set. Fold that\\nnormalization into the initial frame preparation instead (on the staged\\nbuffer for updates, directly on op-\u003eframes pre-registration for new\\nops), so the installed frame is always atomically self-consistent.\\n\\nbcm_rx_handler()\u0027s RX_RTR_FRAME check now takes a lock-protected\\nsnapshot of op-\u003eflags before deciding whether to call bcm_can_tx(),\\nbut does not hold the lock across that call.\\n\\nAlso take a lock-protected snapshot of the currframe in bcm_can_tx()\\nto avoid partly overwrites by content updates in bcm_tx_setup().\\nFinally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset\\nop-\u003ecurrframe between the two locked sections in bcm_can_tx().\\n\\nOmit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler().\\nkt_ival2 may have been concurrently cleared by bcm_rx_setup() before it\\ncancels this timer, so check kt_ival2 inside the bcm_rx_update_lock.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7595de7bc56e0e52b74e56c90f7e247bf626d628\",\"lessThan\":\"96994180bd7b248b0cc698afe926e23fc1bda59b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fbd8fdc2b218e979cfe422b139b8f74c12419d1f\",\"lessThan\":\"caa8704a7f3cb7806331596195385437126ecb3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a437b86ac5a9893c902f30ef66815bf13587bf6\",\"lessThan\":\"a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76c84c3728178b2d38d5604e399dfe8b0752645e\",\"lessThan\":\"a7eb6db1cd3f7b556a301dc1265945ad112089f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cc55dd28c20a6611e30596019b3b2f636819a4c0\",\"lessThan\":\"834cbca3b12e46887f7a9b35f1981a888360ea4c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7\",\"lessThan\":\"19b1994069dd29478ba767de1f98f14a088198dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7\",\"lessThan\":\"fc9f5ee1b073bd233d9c604e338af4ebb42cbc33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7\",\"lessThan\":\"749179c2e25b95d22499ed29096b3e02d6dfd2b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f1c022541bf5a923c8d6fa483112c15250f30a4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c4e8a172501e677ebd8ea9d9161d97dc4df56fbd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.238\",\"lessThan\":\"5.10.265\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.185\",\"lessThan\":\"5.15.216\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.141\",\"lessThan\":\"6.1.183\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.93\",\"lessThan\":\"6.6.148\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.31\",\"lessThan\":\"6.12.101\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.294\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.14.9\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19b1994069dd29478ba767de1f98f14a088198dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/749179c2e25b95d22499ed29096b3e02d6dfd2b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/834cbca3b12e46887f7a9b35f1981a888360ea4c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96994180bd7b248b0cc698afe926e23fc1bda59b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7eb6db1cd3f7b556a301dc1265945ad112089f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/caa8704a7f3cb7806331596195385437126ecb3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc9f5ee1b073bd233d9c604e338af4ebb42cbc33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:54:17+00:00",
      "cve": "CVE-2026-72121",
      "id": "CVE-2026-72121",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "212",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: bcm: add locking when updating filter and timer values",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72121.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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.