Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: NFSv4/flexfiles: reject zero filehandle version count ff_layout_alloc_lseg() decodes the filehandle-version array count from the flexfiles layout body. The value is used as the count for kzalloc_objs(), and the current code only rejects NULL. A zero count yields ZERO_SIZE_PTR, which can be stored in dss_info->fh_versions even though later flexfiles paths assume that at least one filehandle version exists. Reject fh_count == 0 before the allocation, matching the existing zero version_count validation in the flexfiles GETDEVICEINFO parser. A QEMU/KASAN run with a malformed flexfiles layout hit: KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750 ff_layout_encode_layoutreturn+0x683/0x970 nfs4_xdr_enc_layoutreturn+0x278/0x3a0 Kernel panic - not syncing: Fatal exception The patched kernel rejects the malformed layout without KASAN/oops/panic, and a valid fh_count=1 regression still opens, reads, and unmounts cleanly.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d67ae825a59d639e4d8b82413af84d854617a87e before 9033591535c066726f5b505126ccb4068b98fa4f; affected d67ae825a59d639e4d8b82413af84d854617a87e before 18cc6d57a14fa65ab2a2b52279f549041c4bc9cf; affected d67ae825a59d639e4d8b82413af84d854617a87e before be7829715e341b42846437dd9e721005db59f0cc; affected d67ae825a59d639e4d8b82413af84d854617a87e before eeabb9020721db6bc132e68eeae380b8d4fb4b04; affected d67ae825a59d639e4d8b82413af84d854617a87e before 7779c85028a0676fb190cde4f0c540f4f8e97761; affected d67ae825a59d639e4d8b82413af84d854617a87e before d8c90c7cc061265d5f2813a1f5c82ef2f4707e67; affected d67ae825a59d639e4d8b82413af84d854617a87e before 2131ed64b767ffa8bcdb3677d90f3964e39aabc8; affected d67ae825a59d639e4d8b82413af84d854617a87e before 2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2 |
| Linux / Linux | affected 4.0; unaffected 0 before 4.0; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 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/9033591535c066726f5b505126ccb4068b98fa4f
- https://git.kernel.org/stable/c/18cc6d57a14fa65ab2a2b52279f549041c4bc9cf
- https://git.kernel.org/stable/c/be7829715e341b42846437dd9e721005db59f0cc
- https://git.kernel.org/stable/c/eeabb9020721db6bc132e68eeae380b8d4fb4b04
- https://git.kernel.org/stable/c/7779c85028a0676fb190cde4f0c540f4f8e97761
- https://git.kernel.org/stable/c/d8c90c7cc061265d5f2813a1f5c82ef2f4707e67
- https://git.kernel.org/stable/c/2131ed64b767ffa8bcdb3677d90f3964e39aabc8
- https://git.kernel.org/stable/c/2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2
ADP enrichment
No English description supplied.
No references supplied.