can: bcm: fix stale rx/tx ops after device removal
In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix stale rx/tx ops after device removal RX: an RX_SETUP update(!) for an existing op skipped can_rx_register() unconditionally, even when a concurrent NETDEV_UNREGISTER had already torn down its registration (op->rx_reg_dev == NULL). This silently did not re-enable frame delivery for that updated filter. bcm_rx_setup() now re-registers in that case, while leaving rx_ops with ifindex = 0 (all CAN devices) which never carry a tracked rx_reg_dev registered as-is. TX: bcm_notify() only handled bo->rx_ops on NETDEV_UNREGISTER, leaving tx_ops with an active cyclic transmission re-arming its hrtimer indefinitely to execute bcm_tx_timeout_handler(). Cancelling the hrtimer prevents the runaway timer and any injection into a later reused ifindex, since nothing else calls bcm_can_tx() for the op until an explicit TX_SETUP update re-arms it. Unlike bcm_rx_unreg(), which clears the tracked rx_reg_dev for rx_ops, the ifindex is intentionally left unchanged for tx_ops. bcm_tx_setup() always rejects ifindex 0, so clearing it would strand the op: neither a later TX_SETUP (bcm_find_op()) nor TX_DELETE (bcm_delete_tx_op()) could ever find it again, since both require an exact ifindex match.
CVE-2026-72116
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-2026-72116
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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "d30a36066ed3abefb72ae18901f71841ba18b350",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "ca829677ffa2de5d79e06366e19ac1e4f5cc78dd",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "9517d8fb0b191398d35b9b7f8c719c1cc7761cb1",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "60d8a7942f4ed2d975207aaeba1adb576707e53d",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "f749e4564952d60e96930c09f2be99955d07c22e",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "6be3e1fedf03eab36a2c09d755d1171287b2014b",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "b31d0933509c5a35c0be5736a2ce8df0d1bf112c",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
"lessThan": "3b762c0d950383ab7a002686c9136b9aa55d2d70",
"versionType": "git"
}
],
"programFiles": [
"net/can/bcm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.25"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.25",
"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": "6.18.42",
"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/bcm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72116
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #32945 · Revision 1
- Added to Heist Feed
- Publisher date