NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102
In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102 A call to listxattr() with a buffer size = 0 returns the actual size of the buffer needed for a subsequent call. When size > 0, nfs4_listxattr() does not return an error because either generic_listxattr() or nfs4_listxattr_nfs4_label() consumes exactly all the bytes then size is 0 when calling nfs4_listxattr_nfs4_user() which then triggers the following kernel BUG: [ 99.403778] kernel BUG at mm/usercopy.c:102! [ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1 [ 99.415827] Call trace: [ 99.415985] usercopy_abort+0x70/0xa0 [ 99.416227] __check_heap_object+0x134/0x158 [ 99.416505] check_heap_object+0x150/0x188 [ 99.416696] __check_object_size.part.0+0x78/0x168 [ 99.416886] __check_object_size+0x28/0x40 [ 99.417078] listxattr+0x8c/0x120 [ 99.417252] path_listxattr+0x78/0xe0 [ 99.417476] __arm64_sys_listxattr+0x28/0x40 [ 99.417723] invoke_syscall+0x78/0x100 [ 99.417929] el0_svc_common.constprop.0+0x48/0xf0 [ 99.418186] do_el0_svc+0x24/0x38 [ 99.418376] el0_svc+0x3c/0x110 [ 99.418554] el0t_64_sync_handler+0x120/0x130 [ 99.418788] el0t_64_sync+0x194/0x198 [ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000) Issue is reproduced when generic_listxattr() returns 'system.nfs4_acl', thus calling lisxattr() with size = 16 will trigger the bug. Add check
CVE-2024-26870
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-2024-26870
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": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "4403438eaca6e91f02d272211c4d6b045092396b",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "9d52865ff28245fc2134da9f99baff603a24407a",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "06e828b3f1b206de08ef520fc46a40b22e1869cb",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "79cdcc765969d23f4e3d6ea115660c3333498768",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "80365c9f96015bbf048fdd6c8705d3f8770132bf",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "23bfecb4d852751d5e403557dd500bb563313baf",
"versionType": "git"
},
{
"status": "affected",
"version": "012a211abd5db098094ce429de5f046368391e68",
"lessThan": "251a658bbfceafb4d58c76b77682c8bf7bcfad65",
"versionType": "git"
}
],
"programFiles": [
"fs/nfs/nfs4proc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.214",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.153",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.83",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.23",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.7.11",
"versionType": "semver",
"lessThanOrEqual": "6.7.*"
},
{
"status": "unaffected",
"version": "6.8.2",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfs/nfs4proc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-26870
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26439 · Revision 1
- Added to Heist Feed
- Publisher date