nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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, 6.12.111, 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: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 · fixed in bdce362f49410b9def65d76c21f6259cd89696d8; From e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 · fixed in 7aa34ea78f74e6ef60c8112635a87fc43d57f6c9; From e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 · fixed in 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a; From e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 · fixed in 14b978e8d05ce018d0afbeb6611833ef91713a02; From e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 · fixed in d0beaee498e11880e72826026db0e9c9890fc114
- Linux Linux
4.20
- KernelLinux
From 4.20.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4