Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfsd: clear opcnt on compound arg release to prevent OOB read nfsd4_release_compoundargs() resets args->ops to the inline iops[8] array when the dynamically-allocated ops buffer is freed, but leaves args->opcnt at its original value (which can be up to 200 for NFSv4.1+ compounds). If rq_status_counter is stuck at an odd value (which can happen when nfsd_dispatch() hits an error path after setting it odd), the RPC status dumpit handler reads min(opcnt, 16) entries from args->ops[]. Since iops only has 8 elements and is the last field in struct nfsd4_compoundargs, reading indices 8-15 accesses adjacent slab memory and leaks it to userspace via netlink. Zero opcnt unconditionally in nfsd4_release_compoundargs() so stale compound metadata is never exposed through the status interface. [ cel: Remove the kvfree_rcu_mightsleep() sleep from the exposure window ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected bd9d6a3efa9709e653aafbeb859289feccb8e70c before 58bcdfb2b2e412088839ae740b1a95154dc0b8d0; affected bd9d6a3efa9709e653aafbeb859289feccb8e70c before e879148867bd4c4cac42e063ffaffa187dddc6fe; affected bd9d6a3efa9709e653aafbeb859289feccb8e70c before c1a4f7b1848f95302df598217e1c7a1410c2d0c5; affected bd9d6a3efa9709e653aafbeb859289feccb8e70c before ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.