Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls through to its "*str = NULL; return ret" tail, leaving buf NULL with a return value of 0. The "< 0" check does not catch this, and the next line is strrchr(NULL, '.'), a kernel NULL pointer dereference reachable from any pNFS-flexfile client mounted against a malicious or compromised metadata server. Reject the zero-length cases explicitly so the decoder fails with -EBADMSG (treated as a malformed GETDEVICEINFO body) instead of panicking the client.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 76b94cbd32aacf36a641956385a852635c6802b9; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before c8e4e0c701d0192a2efb6df059c0f9e19678c23d; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 427ab81a811dab4bca9d19f82eec5847ae42646e; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 012d37a568bfbb2c9686f03ade75560bc7139956; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 30aae62e50b4e074a90a9a5e15246548fbdc1182; affected 6b7f3cf96364eaf597940cb5c68a682894829915 before 41fe0f7b84f0cb822ae10ab08592996a592b2a25 |
| Linux / Linux | affected 4.0; unaffected 0 before 4.0; unaffected 5.15.211 through 5.15.*; unaffected 6.1.177 through 6.1.*; unaffected 6.6.144 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.38 through 6.18.*; unaffected 7.1.3 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/76b94cbd32aacf36a641956385a852635c6802b9
- https://git.kernel.org/stable/c/c8e4e0c701d0192a2efb6df059c0f9e19678c23d
- https://git.kernel.org/stable/c/6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea
- https://git.kernel.org/stable/c/427ab81a811dab4bca9d19f82eec5847ae42646e
- https://git.kernel.org/stable/c/012d37a568bfbb2c9686f03ade75560bc7139956
- https://git.kernel.org/stable/c/30aae62e50b4e074a90a9a5e15246548fbdc1182
- https://git.kernel.org/stable/c/41fe0f7b84f0cb822ae10ab08592996a592b2a25
ADP enrichment
No English description supplied.
No references supplied.