Answer in brief
CVE-2024-26870 records a Unknown severity vulnerability in NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2024-26870 records a Unknown severity vulnerability in NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=012a211abd5db098094ce429de5f046368391e68 <4403438eaca6e91f02d272211c4d6b045092396b || >=012a211abd5db098094ce429de5f046368391e68 <9d52865ff28245fc2134da9f99baff603a24407a || >=012a211abd5db098094ce429de5f046368391e68 <06e828b3f1b206de08ef520fc46a40b22e1869cb || >=012a211abd5db098094ce429de5f046368391e68 <79cdcc765969d23f4e3d6ea115660c3333498768 || >=012a211abd5db098094ce429de5f046368391e68 <80365c9f96015bbf048fdd6c8705d3f8770132bf || >=012a211abd5db098094ce429de5f046368391e68 <23bfecb4d852751d5e403557dd500bb563313baf || >=012a211abd5db098094ce429de5f046368391e68 <251a658bbfceafb4d58c76b77682c8bf7bcfad65 | 4403438eaca6e91f02d272211c4d6b045092396b, 9d52865ff28245fc2134da9f99baff603a24407a, 06e828b3f1b206de08ef520fc46a40b22e1869cb, 79cdcc765969d23f4e3d6ea115660c3333498768, 80365c9f96015bbf048fdd6c8705d3f8770132bf, 23bfecb4d852751d5e403557dd500bb563313baf, 251a658bbfceafb4d58c76b77682c8bf7bcfad65 |
| Linux/Linuxgeneric | 5.9 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 on nfs4_listxattr() to return ERANGE error when it is called with size > 0 and the return value is greater than size.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=012a211abd5db098094ce429de5f046368391e68 <4403438eaca6e91f02d272211c4d6b045092396b || >=012a211abd5db098094ce429de5f046368391e68 <9d52865ff28245fc2134da9f99baff603a24407a || >=012a211abd5db098094ce429de5f046368391e68 <06e828b3f1b206de08ef520fc46a40b22e1869cb || >=012a211abd5db098094ce429de5f046368391e68 <79cdcc765969d23f4e3d6ea115660c3333498768 || >=012a211abd5db098094ce429de5f046368391e68 <80365c9f96015bbf048fdd6c8705d3f8770132bf || >=012a211abd5db098094ce429de5f046368391e68 <23bfecb4d852751d5e403557dd500bb563313baf || >=012a211abd5db098094ce429de5f046368391e68 <251a658bbfceafb4d58c76b77682c8bf7bcfad65 | 4403438eaca6e91f02d272211c4d6b045092396b, 9d52865ff28245fc2134da9f99baff603a24407a, 06e828b3f1b206de08ef520fc46a40b22e1869cb, 79cdcc765969d23f4e3d6ea115660c3333498768, 80365c9f96015bbf048fdd6c8705d3f8770132bf, 23bfecb4d852751d5e403557dd500bb563313baf, 251a658bbfceafb4d58c76b77682c8bf7bcfad65 |
| Linux/Linuxgeneric | 5.9 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 on nfs4_listxattr() to return ERANGE error when it is called with size > 0 and the return value is greater than size.
Quoted source text, attributed separately from HOL analysis.