cachefiles: Fix NULL pointer dereference in object->file
In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix NULL pointer dereference in object->file At present, the object->file has the NULL pointer dereference problem in ondemand-mode. The root cause is that the allocated fd and object->file lifetime are inconsistent, and the user-space invocation to anon_fd uses object->file. Following is the process that triggers the issue: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object->file) object->file = NULL // file NULL pointer dereference! __cachefiles_write(..., file, ...) Fix this issue by add an additional reference count to the object->file before write/llseek, and decrement after it finished.
CVE-2024-56549
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-2024-56549
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": "c8383054506c77b814489c09877b5db83fd4abf2",
"lessThan": "d6bba3ece960129a553d4b16f1b00c884dc0993a",
"versionType": "git"
},
{
"status": "affected",
"version": "c8383054506c77b814489c09877b5db83fd4abf2",
"lessThan": "785408bbafcfa24c9fc5b251f03fd0780ce182bd",
"versionType": "git"
},
{
"status": "affected",
"version": "c8383054506c77b814489c09877b5db83fd4abf2",
"lessThan": "f98770440c9bc468e2fd878212ec9526dbe08293",
"versionType": "git"
},
{
"status": "affected",
"version": "c8383054506c77b814489c09877b5db83fd4abf2",
"lessThan": "9582c7664103c9043e80a78f5c382aa6bdd67418",
"versionType": "git"
},
{
"status": "affected",
"version": "c8383054506c77b814489c09877b5db83fd4abf2",
"lessThan": "31ad74b20227ce6b40910ff78b1c604e42975cf1",
"versionType": "git"
}
],
"programFiles": [
"fs/cachefiles/interface.c",
"fs/cachefiles/ondemand.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.78",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.11.11",
"versionType": "semver",
"lessThanOrEqual": "6.11.*"
},
{
"status": "unaffected",
"version": "6.12.2",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/cachefiles/interface.c",
"fs/cachefiles/ondemand.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-56549
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30393 · Revision 1
- Added to Heist Feed
- Publisher date