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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-26870

NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 012a211abd5db098094ce429de5f046368391e68 to < 4403438eaca6e91f02d272211c4d6b045092396baffected
  • 012a211abd5db098094ce429de5f046368391e68 to < 9d52865ff28245fc2134da9f99baff603a24407aaffected
  • 012a211abd5db098094ce429de5f046368391e68 to < 06e828b3f1b206de08ef520fc46a40b22e1869cbaffected
  • 012a211abd5db098094ce429de5f046368391e68 to < 79cdcc765969d23f4e3d6ea115660c3333498768affected
  • 012a211abd5db098094ce429de5f046368391e68 to < 80365c9f96015bbf048fdd6c8705d3f8770132bfaffected
  • 012a211abd5db098094ce429de5f046368391e68 to < 23bfecb4d852751d5e403557dd500bb563313bafaffected
  • 012a211abd5db098094ce429de5f046368391e68 to < 251a658bbfceafb4d58c76b77682c8bf7bcfad65affected

Linux Linux

Default version status: affected

  • 5.9affected
  • 0 to < 5.9unaffected
  • 5.10.214 to ≤ 5.10.*unaffected
  • 5.15.153 to ≤ 5.15.*unaffected
  • 6.1.83 to ≤ 6.1.*unaffected
  • 6.6.23 to ≤ 6.6.*unaffected
  • 6.7.11 to ≤ 6.7.*unaffected
  • 6.8.2 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References