Critical 9.8Published Aug 15, 2026

CVE-2026-74350ocfs2: validate fast symlink target during inode read

Updated under an hour ago (Oct 28, 2026, 4:30 PM ET)

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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 (?:?)

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 before dcabbf7da43825e23e5e89adccc1430faee1bce1; from ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 before 030d4caae89977b80349df95523dfda1dfb10f73; from ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 before d94bf50756d7f80bb728ad58246376649e1035b6; from ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 before f9e2cb692b77a679b1f4cc2b7b277fa908586533; from ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 before e234973f286ed2e8961a24561ec91594ec3e3ff8	CNA record

References

References

https://git.kernel.org/stable/c/dcabbf7da43825e23e5e89adccc1430faee1bce1
https://git.kernel.org/stable/c/030d4caae89977b80349df95523dfda1dfb10f73
https://git.kernel.org/stable/c/d94bf50756d7f80bb728ad58246376649e1035b6
https://git.kernel.org/stable/c/f9e2cb692b77a679b1f4cc2b7b277fa908586533
https://git.kernel.org/stable/c/e234973f286ed2e8961a24561ec91594ec3e3ff8

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.