bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor
In the Linux kernel, the following vulnerability has been resolved: bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor bond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and takes RTNL via rtnl_trylock() before undoing the promiscuity it set on the active slave. In that window the active slave can change under RTNL (RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()), which already drops the promiscuity and clears primary_is_promisc. The monitor still acts on the stale decision: if the slave was removed with no failover, curr_active_slave is now NULL and the deref faults; if it failed over, the stale dev_set_promiscuity(-1) underflows the new slave's promiscuity counter and pins it in IFF_PROMISC. Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: b42 bond_alb_monitor RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) Kernel panic - not syncing: Fatal exception Re-check primary_is_promisc (and curr_active_slave) after taking RTNL so the monitor only undoes an increment it still owns. The other bonding monitors already re-read state under RTNL in their commit phase (bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only one actin
CVE-2026-74726
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-2026-74726
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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "f7668762bf5fd6db9397de5c0514407489d9d815",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "09add8d5cfa9c46828f51eaad162c36e86366b71",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "b82f51681a7a88c7d3c865e817a3340d42b5fa2a",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "dd148539fb4741d01c06b7d2c8bd84b01920756c",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "dccec0227ed8d9e36936d66e256b957dc2858468",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "2faf75a8a06504071b4c0aea7e45a9cc49a4e187",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2",
"versionType": "git"
},
{
"status": "affected",
"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
"lessThan": "683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/bonding/bond_alb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"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": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/bonding/bond_alb.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74726
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34288 · Revision 1
- Added to Heist Feed
- Publisher date