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can: isotp: use unconditional synchronize_rcu() in isotp_release()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket. sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path.

Announced Source revision 1
Original source ↗

CVE-2026-72126

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72126

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "22bfa94db2ef6900c790884fa9461486516626e9",
        "lessThan": "945d9894502cd9124f5d676181c542ed2000f7c0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "59672aa4bcd8d32172c1ff6a179583981d6acabc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "15413a082df69175c2f96aeab4c26fe1ff7cff03",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "6280eda96e0707264849fa7d036fed873c1f8a6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "cb6abc584a1bfab107ac003d64948a4aef1730aa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "b88a511308779c225005d7994b8744561bdbafbc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "b8278ff605187ef3fa0f2705e93251cce4c4f8ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "14a4696bc3118ba49da28f79280e1d55603aa737",
        "lessThan": "9b1a02e0d980ac6b0e36a90378f847062f81d7e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "80c6ddf771df2ef786f28c1ca5919b3f1080091b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.50",
        "lessThan": "5.10.261",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.12.17",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.13.2",
        "lessThan": "5.14",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/can/isotp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/can/isotp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72126

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32953 · Revision 1
Added to Heist Feed
Publisher date
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