CVE-2026-80980net/smc: stop killed, freed and out_of_sync sharing a byte
- 9.8CriticalCVSS base score
- 0.68%Exploitation in 30 daysEPSS · top 47% 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: net/smc: stop killed, freed and out_of_sync sharing a byte The three connection state flags are single-bit bitfields, so they occupy one byte of struct smc_connection and every store to one is a read-modify-write of the other two: u8 killed : 1; u8 freed : 1; u8 out_of_sync : 1; They are not written under a common lock. smc_cdc_msg_validate() sets out_of_sync from the receive tasklet, while smc_conn_kill() sets killed from process context under lock_sock(), and the receive path does not defer to the backlog when the socket is owned -- smc_cdc_msg_recv() takes only bh_lock_sock(). Give each flag its own byte so a store no longer touches its neighbours. All readers test them as booleans and are unchanged. struct smc_connection grows by two bytes.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 49 days later
· 49 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.68% · top 47% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < a6efc0f4dbdba6595d89cdaf2d8f26f68be16f0b
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < 297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < 09a9cbadc05f452405de31012bd2c428b601291a
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < 313f79149eb337411c64e2c247234b62ef9a3cb9
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec
- affected b286a0651e4404ab96cdfdcdad8a839a26b3751e – < db51a8658c11a82432b64999519a269c3aabb447
- affected 5.8
- unaffected < 5.8
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/a6efc0f4dbdba6595d89cdaf2d8f26f68be16f0b (opens in a new tab)
- https://git.kernel.org/stable/c/297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b (opens in a new tab)
- https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a (opens in a new tab)
- https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9 (opens in a new tab)
- https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec (opens in a new tab)
- https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447 (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-2026-76303 (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-2026-80980)Record last updated .