openvswitch: only skb_tx_error() a packet we are about to drop
In the Linux kernel, the following vulnerability has been resolved: openvswitch: only skb_tx_error() a packet we are about to drop queue_userspace_packet() borrows the packet skb -- it only copies it into a private netlink message (user_skb) and does not own it; on return do_execute_actions() keeps forwarding it through the flow's remaining actions. Its error path nevertheless calls skb_tx_error(skb), which via skb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY, stripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc says "skb must be freed afterwards"). For a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is what makes esp_input() skb_cow_data() before in-place AEAD; once it is stripped a later local ESP-in-UDP delivery decrypts in place over pages the sender does not own -- an unprivileged page-cache write (the "Fragnesia" primitive). do_execute_actions() ignores output_userspace()'s return value, so any action after a failed USERSPACE upcall inherits the stripped skb. Move the skb_tx_error() to the flow-miss drop path - the "default" branch of ovs_dp_process_packet()'s switch(error), before kfree_skb(). The call has been here since commit 36d5fe6a0007 ("core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors") but was harmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate in-place decrypt; only then did stripping it on a still-forwarded skb become a page-cache write primitive.
CVE-2026-89487
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-2026-89487
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": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "48db11e115d1b232edc5591604adc6eda95cd545",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "4477222e2916a18e273edc139c955ade6bbb7a69",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "4d5c460ef8754be1d43b16dbf02695b008b207d6",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "6767d70cf46f65807a6a4c4406a518e6c12e36ae",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "e41a59fc056f63a7a1f42788913c53cc48d744aa",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "5d85eef222cfd28e73deed7402c100229e8b9e6e",
"versionType": "git"
},
{
"status": "affected",
"version": "36d5fe6a000790f56039afe26834265db0a3ad4c",
"lessThan": "0dbc2398fca3bb33eda963849f865ddb1b3aa05e",
"versionType": "git"
},
{
"status": "affected",
"version": "c5f0c0e7525443add533495e93ba8de6feab2396",
"versionType": "git"
},
{
"status": "affected",
"version": "1674b4bf3eea3cac51b70778e89f8025f7cfe695",
"versionType": "git"
},
{
"status": "affected",
"version": "3.10.51",
"lessThan": "3.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "3.12.40",
"lessThan": "3.13",
"versionType": "semver"
}
],
"programFiles": [
"net/openvswitch/datapath.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/openvswitch/datapath.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89487
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35015 · Revision 1
- Added to Heist Feed
- Publisher date