net: openvswitch: fix potential UAF on meter attach failure
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix potential UAF on meter attach failure While attaching a newly created meter attach_meter() function makes the new meter visible to other CPUs but can still fail afterwards. On failure, it detaches the meter back and returns an error. However, this is an unexpected behavior for the ovs_meter_cmd_set() that uses a plain kfree(meter) on attach failure without waiting for RCU readers to stop using it, assuming it was never visible. This is never a problem for ovs-vswitchd as it always creates meters before creating any flows that use them. But the UAF can be triggered with a custom application using uAPI: BUG: KASAN: slab-use-after-free in ovs_meter_execute (net/openvswitch/meter.c:653) Read of size 8 at addr ffff88810d152650 by task meter/2508 Call Trace: ovs_meter_execute (net/openvswitch/meter.c:653) do_execute_actions (net/openvswitch/actions.c:1407) ovs_execute_actions (net/openvswitch/actions.c:1584) ovs_packet_cmd_execute (net/openvswitch/datapath.c:703) ... netlink_sendmsg (af_netlink.c:1900) Allocated by task 2519: __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415) ovs_meter_cmd_set (net/openvswitch/meter.c:422) ... netlink_sendmsg (af_netlink.c:1900) Freed by task 2519: kfree (mm/slub.c:2705 mm/slub.c:6405 mm/slub.c:6720) ovs_meter_cmd_set (net/openvswitch/meter.c:479) ... netlink_sendmsg (af_netlink.c:1900) Fix that by making sure attach_meter() doesn't make the meter v
CVE-2026-74465
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-2026-74465
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": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "496f3013c6ff759249abcfb2da2361c1a3e2e66d",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "ddc0ef4217cc697c6ba1a295cc1ea42423ec68ac",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "b0de3b58dac3b02b528f72ee0397728aed11f993",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "0310d1fa7f9debd0d89629e9f14c7975a47eaa9a",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "4d03e5fa3fbb1df15258a1eb3d6963f0d65659b3",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "90623c9499627803ef3f04fa25a3199402d4fb95",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "431a295d93f76fbdb6a7cfce92a9e3dfee1e5d61",
"versionType": "git"
},
{
"status": "affected",
"version": "c7c4c44c9a95d87e50ced38f7480e779cb472174",
"lessThan": "a58a2b0ce354df531ebc71fc870058c2feb59f6b",
"versionType": "git"
}
],
"programFiles": [
"net/openvswitch/meter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.8",
"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": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/openvswitch/meter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74465
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33161 · Revision 1
- Added to Heist Feed
- Publisher date