CVE-2026-80980: linux
Vulnerability summary
CVE-2026-80980 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51.3% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 11-09-2026PublishedVulnerability first disclosed.
- 21-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.67%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
+0.07 pp
From 0.60% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu157 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linuxAll versions (No fix recorded) | < 6.12.113-1 | < 7.2.6-1
Linux1 product
- linux≥ b286a0651e4404ab96cdfdcdad8a839a26b3751e, < 297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b | ≥ b286a0651e4404ab96cdfdcdad8a839a26b3751e, < 09a9cbadc05f452405de31012bd2c428b601291a | ≥ b286a0651e4404ab96cdfdcdad8a839a26b3751e, < 313f79149eb337411c64e2c247234b62ef9a3cb9 | ≥ b286a0651e4404ab96cdfdcdad8a839a26b3751e, < 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec | ≥ b286a0651e4404ab96cdfdcdad8a839a26b3751e, < db51a8658c11a82432b64999519a269c3aabb447 | 5.8
3 vendors · 159 products
