- 9.1CriticalCVSS base score
- 0.70%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix out-of-bounds read in ext4_read_inline_dir() ext4_read_inline_dir() can read a dirent header past the end of its inline buffer, triggering a slab-out-of-bounds read during getdents64(): BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry Read of size 2 at addr ffff88800f3dd23c by task exploit/148 ... __ext4_check_dir_entry ext4_read_inline_dir iterate_dir The dirent payload lives in a buffer of exactly inline_size bytes: dir_buf = kmalloc(inline_size, GFP_NOFS); but iteration runs in a position space extra_offset bytes larger (extra_size = extra_offset + inline_size) so the synthetic "." and ".." land at their block-dir offsets. A dirent is formed at "dir_buf + pos - extra_offset", yet the ext4_check_dir_entry() length argument uses the larger extra_size. A position whose dirent header would extend past extra_size is therefore accepted, and the rescan loop's rec_len probe and ext4_check_dir_entry() dereference de->rec_len before the entry is rejected. Reject a position whose minimum-size dirent header would not fit within extra_size before forming de, in both the rescan and main loops, and pass inline_size rather than extra_size to ext4_check_dir_entry() so the length check matches the physical buffer.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 33 days later
· 33 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Received | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.70% · top 46% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < d1e7c186555ad65554fd2f2b02f5a539aa35ae48
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < 5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < 1a1dea633b724a1c042dbcdb1fed27f410916688
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < b060861f662d4826dc700a1c3584243bb3474cfe
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < 6702c7da86d8cdb88d0fc57166286e115ffeb8c0
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < 36bf17bb90cdf7a623499b624b05acde4d2feef5
- affected c4d8b0235aa98f8c26bf94d308be3fdd24154572 – < 9333cc809f0a89e001b814155a6cb8903a6274df
- affected 3.10
- unaffected < 3.10
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/d1e7c186555ad65554fd2f2b02f5a539aa35ae48 (opens in a new tab)
- https://git.kernel.org/stable/c/5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f (opens in a new tab)
- https://git.kernel.org/stable/c/1a1dea633b724a1c042dbcdb1fed27f410916688 (opens in a new tab)
- https://git.kernel.org/stable/c/b060861f662d4826dc700a1c3584243bb3474cfe (opens in a new tab)
- https://git.kernel.org/stable/c/6702c7da86d8cdb88d0fc57166286e115ffeb8c0 (opens in a new tab)
- https://git.kernel.org/stable/c/36bf17bb90cdf7a623499b624b05acde4d2feef5 (opens in a new tab)
- https://git.kernel.org/stable/c/9333cc809f0a89e001b814155a6cb8903a6274df (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80307 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89786)Record last updated .