CVE-2026-80979net/smc: unregister the connection before draining the rx tasklet
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net/smc: unregister the connection before draining the rx tasklet smc_conn_free() calls smc_ism_unset_conn() only while the link group is still on its device list, and never sets conn->killed. smc_lgr_terminate_sched() unlinks the group immediately and defers killing its connections to a work item, so a connection freed in that window keeps its smcd->conn[] slot with both gates in smcd_handle_irq() open, and the device can re-arm the receive tasklet after tasklet_kill() has returned. On the DMB-nocopy path the ghost send buffer is freed right after that drain, so the re-armed tasklet dereferences it. Unregister unconditionally and drain before the detach at both teardown sites, mirroring rmb_desc, which smc_buf_unuse() releases after the drain. Clear conn->sndbuf_desc before freeing it as well, so a reader that samples the pointer cannot get one that is already freed.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd before b6b6ac713ee82b340a8e3be30b101bd2840deec4; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before 5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b74d313567dfc1b7e56629ddbad04e728686f235; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before 36cdf5d48ca191dcd71c28cadbe0981b1d25318d; from 6.6.66 before 6.6.157 | CNA record |
References
- https://git.kernel.org/stable/c/b6b6ac713ee82b340a8e3be30b101bd2840deec4
- https://git.kernel.org/stable/c/b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5
- https://git.kernel.org/stable/c/5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3
- https://git.kernel.org/stable/c/b74d313567dfc1b7e56629ddbad04e728686f235
- https://git.kernel.org/stable/c/36cdf5d48ca191dcd71c28cadbe0981b1d25318d
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.