ext4: avoid use-after-free in ext4_ext_show_leaf()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-49889
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 18:15:11 UTC
Updated2026-05-12 12:17:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: avoid use-after-free in ext4_ext_show_leaf() In ext4_find_extent(), path may be freed by error or be reallocated, so using a previously saved *ppath may have been freed and thus may trigger use-after-free, as follows: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent fails to free path // but zeroout succeeds ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // path use-after-free !!! Similar to ext4_split_extent_at(), we use *ppath directly as an input to ext4_ext_show_leaf(). Fix a spelling error by the way. Same problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only used in ext4_ext_show_leaf(), remove 'path' and use *ppath directly. This issue is triggered only when EXT_DEBUG is defined and therefore does not affect functionality.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 b0cb4561fc4284d04e69c8a66c8504928ab2484e git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 4999fed877bb64e3e7f9ab9996de2ca983c41928 git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 2eba3b0cc5b8de624918d21f32b5b8db59a90b39 git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 34b2096380ba475771971a778a478661a791aa15 git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 8b114f2cc7dd5d36729d040b68432fbd0f0a8868 git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 d483c7cc1796bd6a80e7b3a8fd494996260f6b67 git Not specified
CNA Linux Linux affected dfe5080939ea4686b3414b5d970a9b26733c57a4 4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 git Not specified
CNA Linux Linux affected 3.18 Not specified
CNA Linux Linux unaffected 3.18 semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.113 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.55 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.14 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.3 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified
ADP Siemens RUGGEDCOM RST2428P affected V3.2 custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family affected V3.2 custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family affected V3.2 custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-355557.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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