CVE-2026-53392
CVE CVE-2026-53392EUVD EUVD-2026-45514Published 2026-07-19T12:01:56.000ZLast changed 2026-08-05T12:35:32.000ZCVSS 7.5
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.12.96; d67ae825a59d639e4d8b82413af84d854617a87e <d8c90c7cc061265d5f2813a1f5c82ef2f4707e67; d67ae825a59d639e4d8b82413af84d854617a87e <2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2; d67ae825a59d639e4d8b82413af84d854617a87e <9033591535c066726f5b505126ccb4068b98fa4f; d67ae825a59d639e4d8b82413af84d854617a87e <18cc6d57a14fa65ab2a2b52279f549041c4bc9cf; patch: 5.10.261; 4.0; patch: 7.2-rc1; patch: 7.1.3; d67ae825a59d639e4d8b82413af84d854617a87e <7779c85028a0676fb190cde4f0c540f4f8e97761; patch: 5.15.212; patch: 6.18.38; patch: 0; d67ae825a59d639e4d8b82413af84d854617a87e <be7829715e341b42846437dd9e721005db59f0cc; d67ae825a59d639e4d8b82413af84d854617a87e <2131ed64b767ffa8bcdb3677d90f3964e39aabc8; d67ae825a59d639e4d8b82413af84d854617a87e <eeabb9020721db6bc132e68eeae380b8d4fb4b04; patch: 6.6.145; patch: 6.1.178
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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