hfsplus: validate thread record before delete key rebuild
Published Sep 17, 2026
7.8
HIGHCVSS 3.1
EPSS 0.18%
Description
hfsplus_delete_cat() is called with str == NULL when the last open reference to an unlinked HFS+ hardlink backing inode is closed. In that case, the function finds the catalog thread by CNID and rebuilds the catalog key from thread.nodeName.
That reconstruction path reads thread.nodeName.length directly from the catalog B-tree into fd.search_key and then copies length * 2 bytes into fd.search_key->cat.name.unicode. It does not first check that the found record is a thread record or that its size matches the thread name.
A corrupted image can therefore provide an oversized thread name length and make hfs_bnode_read() write past the catalog search-key allocation.
Read the CNID record through hfsplus_brec_read_cat(), which bounds the record read to sizeof(hfsplus_cat_entry) and verifies that a thread record's size exactly matches nodeName.length. Together, these checks ensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread records before building the delete key from the validated thread name.
Share the thread-record-type helper between hfsplus_find_cat() and hfsplus_delete_cat().
Affected products
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- Version 2.6.12StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<2.6.12
- Version 5.10.270StatusunaffectedConstraints<=5.10.*
- Version 5.15.221StatusunaffectedConstraints<=5.15.*
- Version 6.1.188StatusunaffectedConstraints<=6.1.*
- Version 6.12.110StatusunaffectedConstraints<=6.12.*
- Version 6.18.52StatusunaffectedConstraints<=6.18.*
- Version 6.6.157StatusunaffectedConstraints<=6.6.*
- Version 7.2.6StatusunaffectedConstraints<=7.2.*
- Version 7.3-rc1StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
No CWE recorded.
References (8)
- https://git.kernel.org/stable/c/33cda0036bc683fc888c20b04a5fc030e3e8413b
- https://git.kernel.org/stable/c/473ea7aa35615829f0de7a71e8691d69dc24e328
- https://git.kernel.org/stable/c/7898beee166c1145c0bca364d687b8437435bf1a
- https://git.kernel.org/stable/c/af48abc1b00d865c3f4c4d76b901c44115cb7162
- https://git.kernel.org/stable/c/b9729c51a8b67f8b20b8a8cf395da4be63a0c15b
- https://git.kernel.org/stable/c/e20f3b749ad241df77ec1c3e13a9c22209aa1eb3
- https://git.kernel.org/stable/c/e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20
- https://git.kernel.org/stable/c/e31985c67ba00a59d9b1340af473c1dbe6c87856
Change history (0)
No recorded changes yet.