- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 48db11e115d1b232edc5591604adc6eda95cd545
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 4477222e2916a18e273edc139c955ade6bbb7a69
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 4d5c460ef8754be1d43b16dbf02695b008b207d6
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 6767d70cf46f65807a6a4c4406a518e6c12e36ae
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < e41a59fc056f63a7a1f42788913c53cc48d744aa
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 5d85eef222cfd28e73deed7402c100229e8b9e6e
- affected 36d5fe6a000790f56039afe26834265db0a3ad4c – < 0dbc2398fca3bb33eda963849f865ddb1b3aa05e
- affected c5f0c0e7525443add533495e93ba8de6feab2396
- affected 1674b4bf3eea3cac51b70778e89f8025f7cfe695
- affected 3.10.51 – < 3.11
- affected 3.12.40 – < 3.13
- affected 3.14
- unaffected < 3.14
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a (opens in a new tab)
- https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545 (opens in a new tab)
- https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69 (opens in a new tab)
- https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6 (opens in a new tab)
- https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae (opens in a new tab)
- https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa (opens in a new tab)
- https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e (opens in a new tab)
- https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76393 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89487)Record last updated .