ext4: fix slab-use-after-free in ext4_split_extent_at()
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: 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 =
CVE-2024-49884
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-49884
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "393a46f60ea4f249dc9d496d4eb2d542f5e11ade",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "448100a29395b0c8b4c42967155849fe0fbe808f",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "e52f933598b781d291b9297e39c463536da0e185",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "cafcc1bd62934547c76abf46c6d0d54f135006fe",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "a5401d4c3e2a3d25643c567d26e6de327774a2c9",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "8fe117790b37c84c651e2bad9efc0e7fda73c0e3",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "5d949ea75bb529ea6342e83465938a3b0ac51238",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "915ac3630488af0ca194dc63b86d99802b4f6e18",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "c26ab35702f8cd0cdc78f96aa5856bfb77be798f",
"versionType": "git"
}
],
"programFiles": [
"fs/ext4/extents.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.323",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.290",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.227",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.168",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.113",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.55",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.10.14",
"versionType": "semver",
"lessThanOrEqual": "6.10.*"
},
{
"status": "unaffected",
"version": "6.11.3",
"versionType": "semver",
"lessThanOrEqual": "6.11.*"
},
{
"status": "unaffected",
"version": "6.12",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ext4/extents.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-49884
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26746 · Revision 1
- Added to Heist Feed
- Publisher date