# CVE-2026-80982

## Summary

- **CVE ID:** CVE-2026-80982
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix use-after-free in smc_rx_pipe_buf_release()

smc_rx_splice() hands RMB pages to a pipe and takes a socket reference
per entry so the smc_sock stays alive until the reader finishes. The
connection does not: a concurrent close runs smc_conn_free(), which
releases the receive buffer back to the link group pool.

smc_rx_pipe_buf_release() tests sk_state before taking the socket lock.
The state can change between the test and the lock, and
smc_rx_update_cons() then dereferences conn->rmb_desc and walks
conn->lgr, which smc_conn_free() has already released. On the
is_reg_err path smcr_buf_unuse() frees the descriptor outright, so
this is a use-after-free.

Take the socket lock first and test conn->freed instead.
smc_conn_free() sets that flag before releasing anything, and every
caller holds the socket lock. The two paths exclude each other: either
the pipe release runs first with everything valid, or it sees the flag
and skips the update.

## Affected Products

- Linux — Linux (9014db202cb764b8e14c53e7bacc81f9a1a2ba7f)
- Linux — Linux (4.18)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/6a644a7340df978785f3109d1e0726a982ce2c6f)
- [CNA](https://git.kernel.org/stable/c/0761e49aa78c2f1362511054c6e9670653858837)
- [CNA](https://git.kernel.org/stable/c/0926f59ca0f94120895b92180c636a48d0ed3a6d)
- [CNA](https://git.kernel.org/stable/c/c924884743e948e25625b7fbf3ee2a9325a204a7)
- [CNA](https://git.kernel.org/stable/c/dadd97c8296b23aa816e91ed70041820ae087baa)
- [CNA](https://git.kernel.org/stable/c/df441f3efbb50eb0f120b8de4bf441c31fb0551d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._