Answer in brief
CVE-2024-49883 records a High severity (CVSS 7.8) vulnerability in ext4: aovid use-after-free in ext4_ext_insert_extent(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=10809df84a4d868db61af621bae3658494165279 <e17ebe4fdd7665c93ae9459ba40fcdfb76769ac1 || >=10809df84a4d868db61af621bae3658494165279 <975ca06f3fd154c5f7742083e7b2574c57d1c0c3 || >=10809df84a4d868db61af621bae3658494165279 <5e811066c5ab709b070659197dccfb80ab650ddd || >=10809df84a4d868db61af621bae3658494165279 <9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a || >=10809df84a4d868db61af621bae3658494165279 <51db04892a993cace63415be99848970a0f15ef2 || >=10809df84a4d868db61af621bae3658494165279 <8162ee5d94b8c0351be0a9321be134872a7654a1 || >=10809df84a4d868db61af621bae3658494165279 <beb7b66fb489041c50c6473100b383f7a51648fc || >=10809df84a4d868db61af621bae3658494165279 <bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b || >=10809df84a4d868db61af621bae3658494165279 <a164f3a432aae62ca23d03e6d926b122ee5b860d | e17ebe4fdd7665c93ae9459ba40fcdfb76769ac1, 975ca06f3fd154c5f7742083e7b2574c57d1c0c3, 5e811066c5ab709b070659197dccfb80ab650ddd, 9df59009dfc6d9fc1bd9ddf6c5ab6e56d6ed887a, 51db04892a993cace63415be99848970a0f15ef2, 8162ee5d94b8c0351be0a9321be134872a7654a1, beb7b66fb489041c50c6473100b383f7a51648fc, bfed082ce4b1ce6349b05c09a0fa4f3da35ecb1b, a164f3a432aae62ca23d03e6d926b122ee5b860d |
| Linux/Linuxgeneric | 3.18 | Not reported |
Published upstream
Oct 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: aovid use-after-free in ext4_ext_insert_extent() As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values: ext4_ext_insert_extent path = *ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = *ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); *ppath = path = NULL; path = kcalloc() = 3000 *ppath = 3000; return path; /* here path is still 2000, UAF! */ eh = path[depth].p_hdr ================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...] Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ================================================================== So use *ppath to update the path to avoid the above problem.
Quoted source text, attributed separately from HOL analysis.