net/smc: stop killed, freed and out_of_sync sharing a byte
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.112, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From b286a0651e4404ab96cdfdcdad8a839a26b3751e · fixed in 297e96f38d3e4f1a3b84068950dd5c7a55bbdc7b; From b286a0651e4404ab96cdfdcdad8a839a26b3751e · fixed in 09a9cbadc05f452405de31012bd2c428b601291a; From b286a0651e4404ab96cdfdcdad8a839a26b3751e · fixed in 313f79149eb337411c64e2c247234b62ef9a3cb9; From b286a0651e4404ab96cdfdcdad8a839a26b3751e · fixed in 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec; From b286a0651e4404ab96cdfdcdad8a839a26b3751e · fixed in db51a8658c11a82432b64999519a269c3aabb447
- Linux Linux
5.8
- KernelLinux
From 5.8.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4