net: openvswitch: fix middle attribute validation in push_nsh() action
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix middle attribute validation in push_nsh() action The push_nsh() action structure looks like this: OVS_ACTION_ATTR_PUSH_NSH(OVS_KEY_ATTR_NSH(OVS_NSH_KEY_ATTR_BASE,...)) The outermost OVS_ACTION_ATTR_PUSH_NSH attribute is OK'ed by the nla_for_each_nested() inside __ovs_nla_copy_actions(). The innermost OVS_NSH_KEY_ATTR_BASE/MD1/MD2 are OK'ed by the nla_for_each_nested() inside nsh_key_put_from_nlattr(). But nothing checks if the attribute in the middle is OK. We don't even check that this attribute is the OVS_KEY_ATTR_NSH. We just do a double unwrap with a pair of nla_data() calls - first time directly while calling validate_push_nsh() and the second time as part of the nla_for_each_nested() macro, which isn't safe, potentially causing invalid memory access if the size of this attribute is incorrect. The failure may not be noticed during validation due to larger netlink buffer, but cause trouble later during action execution where the buffer is allocated exactly to the size: BUG: KASAN: slab-out-of-bounds in nsh_hdr_from_nlattr+0x1dd/0x6a0 [openvswitch] Read of size 184 at addr ffff88816459a634 by task a.out/22624 CPU: 8 UID: 0 PID: 22624 6.18.0-rc7+ #115 PREEMPT(voluntary) Call Trace: dump_stack_lvl+0x51/0x70 print_address_description.constprop.0+0x2c/0x390 kasan_report+0xdd/0x110 kasan_check_range+0x35/0x1b0 __asan_memcpy+0x20/0x60 nsh_hdr_from_nlattr+0x1dd/0x6a0 [openvswitch] push_nsh+0
CVE-2025-68785
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-2025-68785
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": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "d0c135b8bbbcf92836068fd395bebeb7ae6c7bef",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "3bc2efff20a38b2c7ca18317649715df0dd62ced",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "1b569db9c2f28b599e40050524aae5f7332bc294",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "10ffc558246f2c75619aedda0921906095e46702",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "2ecfc4433acdb149eafd7fb22d7fd4adf90b25e9",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "c999153bfb2d1d9b295b7010d920f2a7c6d7595f",
"versionType": "git"
},
{
"status": "affected",
"version": "b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3",
"lessThan": "5ace7ef87f059d68b5f50837ef3e8a1a4870c36e",
"versionType": "git"
}
],
"programFiles": [
"net/openvswitch/flow_netlink.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.248",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.198",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.160",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.120",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/openvswitch/flow_netlink.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-68785
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39121 · Revision 1
- Added to Heist Feed
- Publisher date