nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net
In the Linux kernel, the following vulnerability has been resolved: nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net In the normal case, when we excute `echo 0 > /proc/fs/nfsd/threads`, the function `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` will release all resources related to the hashed `nfs4_client`. If the `nfsd_client_shrinker` is running concurrently, the `expire_client` function will first unhash this client and then destroy it. This can lead to the following warning. Additionally, numerous use-after-free errors may occur as well. nfsd_client_shrinker echo 0 > /proc/fs/nfsd/threads expire_client nfsd_shutdown_net unhash_client ... nfs4_state_shutdown_net /* won't wait shrinker exit */ /* cancel_work(&nn->nfsd_shrinker_work) * nfsd_file for this /* won't destroy unhashed client1 */ * client1 still alive nfs4_state_destroy_net */ nfsd_file_cache_shutdown /* trigger warning */ kmem_cache_destroy(nfsd_file_slab) kmem_cache_destroy(nfsd_file_mark_slab) /* release nfsd_file and mark */ __destroy_client ==================================================================== BUG nfsd_file (Not tainted): Objects remaining in nfsd_file on __kmem_cache_shutdown() -------------------------------------------------------------------- CPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_des
CVE-2024-50121
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-2024-50121
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": "2bbf10861d51dae76c6da7113516d0071c782653",
"lessThan": "f67138dd338cb564ade7d3755c8cd4f68b46d397",
"versionType": "git"
},
{
"status": "affected",
"version": "958294a3eb82026fcfff20b0287a90e9c854785e",
"lessThan": "5ade4382de16c34d9259cb548f36ec5c4555913c",
"versionType": "git"
},
{
"status": "affected",
"version": "f3ea5ec83d1a827f074b2b660749817e0bf2b23e",
"lessThan": "36775f42e039b01d4abe8998bf66771a37d3cdcc",
"versionType": "git"
},
{
"status": "affected",
"version": "7c24fa225081f31bc6da6a355c1ba801889ab29a",
"lessThan": "f965dc0f099a54fca100acf6909abe52d0c85328",
"versionType": "git"
},
{
"status": "affected",
"version": "7c24fa225081f31bc6da6a355c1ba801889ab29a",
"lessThan": "add1df5eba163a3a6ece11cb85890e2e410baaea",
"versionType": "git"
},
{
"status": "affected",
"version": "7c24fa225081f31bc6da6a355c1ba801889ab29a",
"lessThan": "d5ff2fb2e7167e9483846e34148e60c0c016a1f6",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.220",
"lessThan": "5.10.233",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.154",
"lessThan": "5.15.176",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.81",
"lessThan": "6.1.123",
"versionType": "semver"
}
],
"programFiles": [
"fs/nfsd/nfs4state.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.233",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.176",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.123",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.59",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.11.6",
"versionType": "semver",
"lessThanOrEqual": "6.11.*"
},
{
"status": "unaffected",
"version": "6.12",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfs4state.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-50121
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26784 · Revision 1
- Added to Heist Feed
- Publisher date