CVE-2026-80854: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-80854DEBIAN-CVE-2026-80854
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80854 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.3% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0506OPENSUSE-SU-2026:11773-1

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: keep port count until LUN teardown completes tcm_usbg_drop_nexus() permits session removal once tpg_port_count reaches zero. However, usbg_port_unlink() currently decrements that count from the fabric_pre_unlink() callback, before core_dev_del_lun() waits for active se_lun references to drain. If removal of the last LUN races a nexus removal, the latter can observe a zero port count and call target_remove_session(). This frees sess_cmd_map while an in-flight struct usbg_cmd, including its work item, can still be accessed. Overlapping the last-LUN unlink with nexus removal reproduces this lifetime violation as a DEBUG_OBJECTS "free active" warning for usbg_cmd_work, followed by a target-core BUG/Oops. The generic target-core unlink path has no callback after core_dev_del_lun() completes. Add an optional fabric_post_unlink() callback and use it for the f_tcm port count. The count now remains nonzero until core_dev_del_lun() has finished draining active LUN references, preventing nexus removal from freeing the session during command completion.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 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)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.111-1 | < 7.1.13-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ c52661d60f636d17e26ad834457db333bd1df494, < c494c5562ca69b61a82f566e3b87a445d2c28929 | ≥ c52661d60f636d17e26ad834457db333bd1df494, < c1f359d9a5efed458946063de65ddbeaacc4f165 | ≥ c52661d60f636d17e26ad834457db333bd1df494, < 178f59a0bccd3f66cdfa5184310f31a58b7257c4 | ≥ c52661d60f636d17e26ad834457db333bd1df494, < ad6f0375d2e93a1d8c015463e5e92dfcb26e311b | ≥ c52661d60f636d17e26ad834457db333bd1df494, < 2efbfd42441d3ef8137aff2d59e9835e1d5ae780 | ≥ c52661d60f636d17e26ad834457db333bd1df494, < 85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95 | ≥ c52661d60f636d17e26ad834457db333bd1df494, < bbd6aa311a9f4dd17822c7557451458d3d2e980b | ≥ c52661d60f636d17e26ad834457db333bd1df494, < eaa96a8458f54d6cf0954242ab8b1df2a6fccafa | ≥ c52661d60f636d17e26ad834457db333bd1df494, < c39d0916da47d94909391876c9e5bd429ea7b1b9 | 3.5

3 vendors · 172 products

References

13 links
Show all 13 references