Description
In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent into a single page-cache page. The existing logic only checks whether the dirent fits in the remaining space of the current page and advances to a fresh page if not. It never checks whether the dirent itself exceeds PAGE_SIZE. As a result, a malicious FUSE server can return a dirent with namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB page systems this causes memcpy() to overflow the cache page by 24 bytes into the following kernel page. Reject dirents that cannot fit in a single page before copying them into the readdir cache.
CVSS breakdown
Affected products
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 3059f9abe7f1ba8fddf3c86c5faa1eeacf07e7d4
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 1d4a517fa90480c52fd452fea2686cd80f773ce2
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 038e61812fa52ef62bad2cfc96bf37dc0db47c1e
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – d23ad78bfd205eac26766e38ba7d79f279131098
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 45c05af36311624c1148123caeb011312495d86b
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 7de93abfaae1b2dc94da8a07a36421bd073f1d8f
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 474ce83c96a55f2eeb14dee2be375eeadfdacdf5
- Linux / Linux69e34551152a286f827d54dcb5700da6aeaac1fb – 51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
- Linux / Linux4.20 – 4.20
- Linux / Linux0 – 4.20
- Linux / Linux5.10.258 – 5.10.*
- Linux / Linux5.15.209 – 5.15.*
- Linux / Linux6.1.175 – 6.1.*
- Linux / Linux6.6.136 – 6.6.*
- Linux / Linux6.12.84 – 6.12.*
- Linux / Linux6.18.25 – 6.18.*
- Linux / Linux7.0.2 – 7.0.*
- Linux / Linux7.1 – *
- Linux / Linux27992ef80770d61a57f6c3a551735b08cefdffa3 – 474ce83c96a55f2eeb14dee2be375eeadfdacdf5
- Linux / Linux27992ef80770d61a57f6c3a551735b08cefdffa3 – 51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
- Linux / Linux6.15 – 6.15
- Linux / Linux0 – 6.15
- Linux / Linux27992ef80770d61a57f6c3a551735b08cefdffa3 – 7de93abfaae1b2dc94da8a07a36421bd073f1d8f
- Linux / Linux kernel4.20 – 6.6.136
- Linux / Linux kernel7.1 – 7.1
- Linux / Linux kernel7.1 – 7.1
- Siemens / simatic_s7-1500_tm_mfp_firmware