net: gso: fix ownership in __udp_gso_segment
In the Linux kernel, the following vulnerability has been resolved: net: gso: fix ownership in __udp_gso_segment In __udp_gso_segment the skb destructor is removed before segmenting the skb but the socket reference is kept as-is. This is an issue if the original skb is later orphaned as we can hit the following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 The above can happen following a sequence of events when using OpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an OVS_ACTION_ATTR_OUTPUT action: 1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through queue_gso_packets and then __udp_gso_segment, where its destructor is removed. 2. The segments' data are copied and sent to userspace. 3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same original skb is sent to its path. 4. If it later hits skb_orphan, we hit the bug. Fix this by also removing the reference to the socket in __udp_gso_segment.
CVE-2025-21926
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-2025-21926
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": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "9f28205ddb76e86cac418332e952241d85fed0dc",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "a2d1cca955ed34873e524cc2e6e885450d262f05",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "455217ac9db0cf9349b3933664355e907bb1a569",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "e8db70537878e1bb3fd83e5abcc6feefc0587828",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "01a83237644d6822bc7df2c5564fc81b0df84358",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "084819b0d8b1bd433b90142371eb9450d657f8ca",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b",
"versionType": "git"
},
{
"status": "affected",
"version": "ad405857b174ed31a97982bb129c320d03321cf5",
"lessThan": "ee01b2f2d7d0010787c2343463965bbc283a497f",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/udp_offload.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.131",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.83",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.19",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.7",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/udp_offload.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21926
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26970 · Revision 1
- Added to Heist Feed
- Publisher date