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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-80979

net/smc: unregister the connection before draining the rx tasklet

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd to < b6b6ac713ee82b340a8e3be30b101bd2840deec4affected
  • ae2be35cbed2c8385e890147ea321a3fcc3ca5fa to < b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5affected
  • ae2be35cbed2c8385e890147ea321a3fcc3ca5fa to < 5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3affected
  • ae2be35cbed2c8385e890147ea321a3fcc3ca5fa to < b74d313567dfc1b7e56629ddbad04e728686f235affected
  • ae2be35cbed2c8385e890147ea321a3fcc3ca5fa to < 36cdf5d48ca191dcd71c28cadbe0981b1d25318daffected
  • 6.6.66 to < 6.6.157affected

Linux Linux

Default version status: affected

  • 6.10affected
  • 0 to < 6.10unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References