Vulnerability-Lookup

FKIE_CVE-2026-43076

Vulnerability from fkie_nvd - Published: 2026-05-06 10:16 - Updated: 2026-05-20 23:19

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate inline data i_size during inode read When reading an inode from disk, ocfs2_validate_inode_block() performs various sanity checks but does not validate the size of inline data. If the filesystem is corrupted, an inode's i_size can exceed the actual inline data capacity (id_count). This causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data buffer, triggering a use-after-free when accessing directory entries from freed memory. In the syzbot report: - i_size was 1099511627576 bytes (~1TB) - Actual inline data capacity (id_count) is typically <256 bytes - A garbage rec_len (54648) caused ctx->pos to jump out of bounds - This triggered a UAF in ocfs2_check_dir_entry() Fix by adding a validation check in ocfs2_validate_inode_block() to ensure inodes with inline data have i_size <= id_count. This catches the corruption early during inode read and prevents all downstream code from operating on invalid data.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.24
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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    }
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  "lastModified": "2026-05-20T23:19:25.910",
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          "confidentialityImpact": "HIGH",
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CVE-2026-43076 (GCVE-0-2026-43076)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17

Title

ocfs2: validate inline data i_size during inode read

Summary

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/37f074e65f24f10f8…
https://git.kernel.org/stable/c/c1de19e891be3bfb3…
https://git.kernel.org/stable/c/cd2d765aa7157f852…
https://git.kernel.org/stable/c/77d0295725109d77f…
https://git.kernel.org/stable/c/1524af3685b35feac…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 23193e513d1cd69411469f028d56fd175d4a6b07 , < 37f074e65f24f10f8d8df224a572e4cb9e6faf63 (git) Affected: 23193e513d1cd69411469f028d56fd175d4a6b07 , < c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b (git) Affected: 23193e513d1cd69411469f028d56fd175d4a6b07 , < cd2d765aa7157f852999842af32148128c735d39 (git) Affected: 23193e513d1cd69411469f028d56fd175d4a6b07 , < 77d0295725109d77f5854ef5b58c0d06c08168cc (git) Affected: 23193e513d1cd69411469f028d56fd175d4a6b07 , < 1524af3685b35feac76662cc551cbc37bd14775f (git)
Linux	Linux	Affected: 2.6.24 Unaffected: 0 , < 2.6.24 (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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FKIE_CVE-2026-43076

CVE-2026-43076 (GCVE-0-2026-43076)

Tags

Sightings

Nomenclature