Answer in brief
CVE-2024-49884 records a High severity (CVSS 7.8) vulnerability in ext4: fix slab-use-after-free in ext4_split_extent_at(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <393a46f60ea4f249dc9d496d4eb2d542f5e11ade || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <448100a29395b0c8b4c42967155849fe0fbe808f || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <e52f933598b781d291b9297e39c463536da0e185 || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <cafcc1bd62934547c76abf46c6d0d54f135006fe || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <a5401d4c3e2a3d25643c567d26e6de327774a2c9 || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <8fe117790b37c84c651e2bad9efc0e7fda73c0e3 || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <5d949ea75bb529ea6342e83465938a3b0ac51238 || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <915ac3630488af0ca194dc63b86d99802b4f6e18 || >=dfe5080939ea4686b3414b5d970a9b26733c57a4 <c26ab35702f8cd0cdc78f96aa5856bfb77be798f | 393a46f60ea4f249dc9d496d4eb2d542f5e11ade, 448100a29395b0c8b4c42967155849fe0fbe808f, e52f933598b781d291b9297e39c463536da0e185, cafcc1bd62934547c76abf46c6d0d54f135006fe, a5401d4c3e2a3d25643c567d26e6de327774a2c9, 8fe117790b37c84c651e2bad9efc0e7fda73c0e3, 5d949ea75bb529ea6342e83465938a3b0ac51238, 915ac3630488af0ca194dc63b86d99802b4f6e18, c26ab35702f8cd0cdc78f96aa5856bfb77be798f |
| Linux/Linuxgeneric | 3.18 | Not reported |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V3.2 | V3.2 |
| Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familygeneric | >=0 <V3.2 | V3.2 |
| Siemens/SCALANCE XCM-/XRM-/XCH-/XRH-300 familygeneric | >=0 <V3.2 | V3.2 |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
Published upstream
Oct 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ext4: fix slab-use-after-free in ext4_split_extent_at() We hit the following use-after-free: ================================================================== BUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0 Read of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40 CPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724 Call Trace: <TASK> kasan_report+0x93/0xc0 ext4_split_extent_at+0xba8/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Allocated by task 40: __kmalloc_noprof+0x1ac/0x480 ext4_find_extent+0xf3b/0x1e70 ext4_ext_map_blocks+0x188/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Freed by task 40: kfree+0xf1/0x2b0 ext4_find_extent+0xa71/0x1e70 ext4_ext_insert_extent+0xa22/0x3260 ext4_split_extent_at+0x3ef/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ================================================================== The flow of issue triggering is as follows: ext4_split_extent_at path = *ppath ext4_ext_insert_extent(ppath) ext4_ext_create_new_leaf(ppath) ext4_find_extent(orig_path) path = *orig_path read_extent_tree_block // return -ENOMEM or -EIO ext4_free_ext_path(path) kfree(path) *orig_path = NULL a. If err is -ENOMEM: ext4_ext_dirty(path + path->p_depth) // path use-after-free !!! b. If err is -EIO and we have EXT_DEBUG defined: ext4_ext_show_leaf(path) eh = path[depth].p_hdr // path also use-after-free !!! So when trying to zeroout or fix the extent length, call ext4_find_extent() to update the path. In addition we use *ppath directly as an ext4_ext_show_leaf() input to avoid possible use-after-free when EXT_DEBUG is defined, and to avoid unnecessary path updates.
Quoted source text, attributed separately from HOL analysis.