CVE-2024-26870NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102
Updated under an hour ago ()
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 012a211abd5db098094ce429de5f046368391e68 before 4403438eaca6e91f02d272211c4d6b045092396b; 012a211abd5db098094ce429de5f046368391e68 builds before 9d52865ff28245fc2134da9f99baff603a24407a; 012a211abd5db098094ce429de5f046368391e68 builds before 06e828b3f1b206de08ef520fc46a40b22e1869cb; from 012a211abd5db098094ce429de5f046368391e68 before 79cdcc765969d23f4e3d6ea115660c3333498768; from 012a211abd5db098094ce429de5f046368391e68 before 80365c9f96015bbf048fdd6c8705d3f8770132bf; from 012a211abd5db098094ce429de5f046368391e68 before 23bfecb4d852751d5e403557dd500bb563313baf; from 012a211abd5db098094ce429de5f046368391e68 before 251a658bbfceafb4d58c76b77682c8bf7bcfad65 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.9 before 5.10.214; from 5.11 before 5.15.153; from 5.16 before 6.1.83; from 6.2 before 6.6.23; from 6.7 before 6.7.11; from 6.8 before 6.8.2 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396bpatch
- https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407apatch
- https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cbpatch
- https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768patch
- https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bfpatch
- https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313bafpatch
- https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlmailing-list
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.