CVE-2024-49889ext4: avoid use-after-free in ext4_ext_show_leaf()
- 7.8HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% 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: 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.
Timeline
ID reserved
By Linux
Published
- 24 months later
· 24 months 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 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < b0cb4561fc4284d04e69c8a66c8504928ab2484e
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < 4999fed877bb64e3e7f9ab9996de2ca983c41928
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < 2eba3b0cc5b8de624918d21f32b5b8db59a90b39
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < 34b2096380ba475771971a778a478661a791aa15
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < 8b114f2cc7dd5d36729d040b68432fbd0f0a8868
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < d483c7cc1796bd6a80e7b3a8fd494996260f6b67
- affected dfe5080939ea4686b3414b5d970a9b26733c57a4 – < 4e2524ba2ca5f54bdbb9e5153bea00421ef653f5
- affected 3.18
- unaffected < 3.18
- unaffected 5.10.227 – ≤ 5.10.*
- unaffected 5.15.168 – ≤ 5.15.*
- unaffected 6.1.113 – ≤ 6.1.*
- unaffected 6.6.55 – ≤ 6.6.*
- unaffected 6.10.14 – ≤ 6.10.*
- unaffected 6.11.3 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References11
- https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484e (opens in a new tab)
- https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928 (opens in a new tab)
- https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39 (opens in a new tab)
- https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15 (opens in a new tab)
- https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868 (opens in a new tab)
- https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67 (opens in a new tab)
- https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html (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-2024-43589 (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-2024-49889)Record last updated .