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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-80980

net/smc: stop killed, freed and out_of_sync sharing a byte

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Status
Published
Published
Updated
Assigning organization
Linux

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.

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

  • b286a0651e4404ab96cdfdcdad8a839a26b3751e to < 297e96f38d3e4f1a3b84068950dd5c7a55bbdc7baffected
  • b286a0651e4404ab96cdfdcdad8a839a26b3751e to < 09a9cbadc05f452405de31012bd2c428b601291aaffected
  • b286a0651e4404ab96cdfdcdad8a839a26b3751e to < 313f79149eb337411c64e2c247234b62ef9a3cb9affected
  • b286a0651e4404ab96cdfdcdad8a839a26b3751e to < 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aecaffected
  • b286a0651e4404ab96cdfdcdad8a839a26b3751e to < db51a8658c11a82432b64999519a269c3aabb447affected

Linux Linux

Default version status: affected

  • 5.8affected
  • 0 to < 5.8unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References