# CVE-2026-74350: linux: In the Linux kernel, the following vulnerability has been resolved:  ocfs2: validate fast symlink target during inode...

CVE-2026-74350 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-74350, released August 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-74350
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  ocfs2: validate fast symlink target during inode read  ocfs2_validate_inode_block() already rejects several inconsistent self-contained dinodes before they are exposed to the rest of the filesystem.  Fast symlinks need the same treatment.  A zero-cluster symlink is treated as a fast symlink and later read through page_get_link() and ocfs2_fast_symlink_read_folio().  That path uses strnlen() on the inline payload and then copies len + 1 bytes into the folio.  If a corrupt dinode stores an i_size that does not fit the inline area or omits the terminating NUL at i_size, that copy reads past the end of the inode block buffer.  Reject zero-cluster symlink dinodes whose i_size exceeds the inline fast-symlink capacity or whose inline payload is not NUL-terminated exactly at i_size when the inode block is validated.  This keeps malformed fast symlinks from reaching the read path.  Validation reproduced this kernel report: KASAN use-after-free in ocfs2_fast_symlink_read_folio+0x12c/0x1f0 RIP: 0033:0x7f5c6d859aa7 Read of size 3905 Call trace:   dump_stack_lvl+0x66/0xa0 (?:?)   print_report+0xce/0x630 (?:?)   ocfs2_fast_symlink_read_folio+0x12c/0x1f0 (fs/ocfs2/inode.c:?)   srso_alias_return_thunk+0x5/0xfbef5 (?:?)   __virt_addr_valid+0x19f/0x330 (?:?)   kasan_report+0xe0/0x110 (?:?)   kasan_check_range+0x105/0x1b0 (?:?)   __asan_memcpy+0x23/0x60 (?:?)   filemap_read_folio+0x27/0xe0 (?:?)   filemap_read_folio+0x35/0xe0 (?:?)   do_read_cache_folio+0x138/0x230 (?:?)   __page_get_link+0x26/0x110 (?:?)   page_get_link+0x2e/0x70 (?:?)   vfs_readlink+0x15e/0x250 (?:?)   touch_atime+0x4d/0x370 (?:?)   do_readlinkat+0x186/0x200 (?:?)   do_user_addr_fault+0x65a/0x890 (?:?)   __x64_sys_readlink+0x46/0x60 (?:?)   do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)   entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-74350](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74350.md) | Aug 15, 2026 |
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-74350](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74350.md) | Aug 15, 2026 |

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Data as of 2026-11-10T13:56:55Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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