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.

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.

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.

fuse: reject oversized dirents in page cache

In the Linux kernel, the following vulnerability has been resolved: f ...

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.

Security update for the Linux Kernel (Live Patch 24 for SUSE Linux Enterprise 15 SP6)

Security update for the Linux Kernel (Live Patch 44 for SUSE Linux Enterprise 15 SP4)

Security update for the Linux Kernel (Live Patch 38 for SUSE Linux Enterprise 15 SP5)

Security update for the Linux Kernel (Live Patch 14 for SUSE Linux Enterprise 15 SP7)

Security update for the Linux Kernel (Live Patch 30 for SUSE Linux Enterprise 15 SP5)

Security update for the Linux Kernel (Live Patch 26 for SUSE Linux Enterprise 15 SP5)

Security update for the Linux Kernel (Live Patch 23 for SUSE Linux Enterprise 15 SP6)

Security update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise 15 SP7)

Security update for the Linux Kernel (Live Patch 47 for SUSE Linux Enterprise 15 SP4)

Security update for the Linux Kernel RT (Live Patch 11 for SUSE Linux Enterprise 15 SP7)

Security update for the Linux Kernel (Live Patch 46 for SUSE Linux Enterprise 15 SP4)

Security update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise 15 SP6)

Security update for the Linux Kernel (Live Patch 18 for SUSE Linux Enterprise 15 SP6)

Security update for the Linux Kernel RT (Live Patch 1 for SUSE Linux Enterprise 15 SP7)