macvlan: observe an RCU grace period in macvlan_common_newlink() error path
In the Linux kernel, the following vulnerability has been resolved: macvlan: observe an RCU grace period in macvlan_common_newlink() error path valis reported that a race condition still happens after my prior patch. macvlan_common_newlink() might have made @dev visible before detecting an error, and its caller will directly call free_netdev(dev). We must respect an RCU period, either in macvlan or the core networking stack. After adding a temporary mdelay(1000) in macvlan_forward_source_one() to open the race window, valis repro was: ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source (ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 &) ; sleep 0.5 ; ping -c1 -I p1 1.2.3.4 PING 1.2.3.4 (1.2.3.4): 56 data bytes RTNETLINK answers: Invalid argument BUG: KASAN: slab-use-after-free in macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) Read of size 8 at addr ffff888016bb89c0 by task e/175 CPU: 1 UID: 1000 PID: 175 Comm: e Not tainted 6.19.0-rc8+ #33 NONE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 Call Trace: dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) ? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) kasan_report (mm/kasan/report.c:597) ? macvlan_forward_source (drivers/net/macvlan.c:408
CVE-2026-23273
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-2026-23273
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": "da5c6b8ae47e414be47e5e04def15b25d5c962dc",
"lessThan": "91e4ff8d966978901630fc29582c1a76d3c6e46c",
"versionType": "git"
},
{
"status": "affected",
"version": "5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a",
"lessThan": "3d94323c80d7fc4da5f10f9bb06a45d39d5d3cc4",
"versionType": "git"
},
{
"status": "affected",
"version": "c43d0e787cbba569ec9d11579ed370b50fab6c9c",
"lessThan": "721eb342d9ba19bad5c4815ea3921465158b7362",
"versionType": "git"
},
{
"status": "affected",
"version": "11ba9f0dc865136174cb98834280fb21bbc950c7",
"lessThan": "19c7d8ac51988d053709c1e85bd8482076af845d",
"versionType": "git"
},
{
"status": "affected",
"version": "986967a162142710076782d5b93daab93a892980",
"lessThan": "a1f686d273d129b45712d95f4095843b864466bd",
"versionType": "git"
},
{
"status": "affected",
"version": "cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66",
"lessThan": "d34f7a8aa9a25b7e64e0e46e444697c0f702374d",
"versionType": "git"
},
{
"status": "affected",
"version": "f8db6475a83649689c087a8f52486fcc53e627e9",
"lessThan": "1e58ae87ad1e6e24368dea9aec9048c758cd0e2b",
"versionType": "git"
},
{
"status": "affected",
"version": "f8db6475a83649689c087a8f52486fcc53e627e9",
"lessThan": "e3f000f0dee1bfab52e2e61ca6a3835d9e187e35",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.250",
"lessThan": "5.10.252",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.200",
"lessThan": "5.15.202",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.163",
"lessThan": "6.1.165",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.124",
"lessThan": "6.6.128",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.70",
"lessThan": "6.12.75",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.10",
"lessThan": "6.18.14",
"versionType": "semver"
}
],
"programFiles": [
"drivers/net/macvlan.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.252",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.14",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.4",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/macvlan.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23273
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39834 · Revision 1
- Added to Heist Feed
- Publisher date