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