ext4: avoid use-after-free in ext4_ext_show_leaf()
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.
CVE-2024-49889
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-2024-49889
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": "b0cb4561fc4284d04e69c8a66c8504928ab2484e",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "4999fed877bb64e3e7f9ab9996de2ca983c41928",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "2eba3b0cc5b8de624918d21f32b5b8db59a90b39",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "34b2096380ba475771971a778a478661a791aa15",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "8b114f2cc7dd5d36729d040b68432fbd0f0a8868",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "d483c7cc1796bd6a80e7b3a8fd494996260f6b67",
"versionType": "git"
},
{
"status": "affected",
"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4",
"lessThan": "4e2524ba2ca5f54bdbb9e5153bea00421ef653f5",
"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": "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-2024-49889
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26747 · Revision 1
- Added to Heist Feed
- Publisher date