can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER
In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER isotp_release() looked up the bound network device via dev_get_by_index() using the stored ifindex. During device unregistration the device is unlisted from the ifindex hash before the NETDEV_UNREGISTER notifier chain runs, so a concurrent isotp_release() could find no device, skip can_rx_unregister() entirely, and still proceed to free the socket. Since isotp_release() had already removed itself from the isotp notifier list at that point, isotp_notify() would never get a chance to clean up either, leaving a stale CAN filter that keeps pointing at the freed socket. Fix this the same way raw.c already does: hold a tracked reference to the bound net_device in the socket (so->dev/so->dev_tracker) from bind() onward instead of re-resolving it from the ifindex, and serialize bind()/release() with rtnl_lock() so that so->dev is always consistent with what the NETDEV_UNREGISTER notifier sees. so->dev stays valid regardless of ifindex-hash unlisting, and is only ever cleared by whichever of isotp_release()/isotp_notify() gets there first, so the filter is always removed exactly once. isotp_bind() now rejects a (re)bind with -EAGAIN while so->[tx|rx].state isn't ISOTP_IDLE yet, so a timer left running by a prior NETDEV_UNREGISTER can't act on a newly bound so->ifindex. Both checks share the same lock_sock() section, so there is no window in which a
CVE-2026-72125
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-2026-72125
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": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "f311bbb29bb06aaab69ba45a6e4b11323d20b8f9",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "8e018f4335590460ebcf0c2b493ed38ba1a35204",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "33b9cd9245e2a4b800f99ed1cc53d64960614152",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "43884dc7963beef2328f507f4fe680bdc173eb80",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "7bef39ba76eb7307ed22a50329e0f5776dbeda58",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "e442b62ba5a7756c17e05a77b32cdd085a2b6138",
"versionType": "git"
},
{
"status": "affected",
"version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
"lessThan": "20bab8b88baac140ca3701116e1d486c7f51e311",
"versionType": "git"
}
],
"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": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"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-2026-72125
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #32952 · Revision 1
- Added to Heist Feed
- Publisher date