CVE-2024-49889ext4: avoid use-after-free in ext4_ext_show_leaf()
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/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
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from dfe5080939ea4686b3414b5d970a9b26733c57a4 before b0cb4561fc4284d04e69c8a66c8504928ab2484e; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before 4999fed877bb64e3e7f9ab9996de2ca983c41928; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before 2eba3b0cc5b8de624918d21f32b5b8db59a90b39; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before 34b2096380ba475771971a778a478661a791aa15; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before 8b114f2cc7dd5d36729d040b68432fbd0f0a8868; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before d483c7cc1796bd6a80e7b3a8fd494996260f6b67; from dfe5080939ea4686b3414b5d970a9b26733c57a4 before 4e2524ba2ca5f54bdbb9e5153bea00421ef653f5 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.2 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 5.10.227; from 5.11 before 5.15.168; from 5.16 before 6.1.113; from 6.2 before 6.6.55; from 6.7 before 6.10.14; from 6.11 before 6.11.3 | NVD |
References
- https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484epatch
- https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928patch
- https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39patch
- https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15patch
- https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868patch
- https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67patch
- https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
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.