ghsa-49g6-x26j-85g3
Vulnerability from github
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": [],
"aliases": [
"CVE-2024-26870"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-17T11:15:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\n\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size \u003e 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n\n [ 99.403778] kernel BUG at mm/usercopy.c:102!\n [ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n [ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n [ 99.415827] Call trace:\n [ 99.415985] usercopy_abort+0x70/0xa0\n [ 99.416227] __check_heap_object+0x134/0x158\n [ 99.416505] check_heap_object+0x150/0x188\n [ 99.416696] __check_object_size.part.0+0x78/0x168\n [ 99.416886] __check_object_size+0x28/0x40\n [ 99.417078] listxattr+0x8c/0x120\n [ 99.417252] path_listxattr+0x78/0xe0\n [ 99.417476] __arm64_sys_listxattr+0x28/0x40\n [ 99.417723] invoke_syscall+0x78/0x100\n [ 99.417929] el0_svc_common.constprop.0+0x48/0xf0\n [ 99.418186] do_el0_svc+0x24/0x38\n [ 99.418376] el0_svc+0x3c/0x110\n [ 99.418554] el0t_64_sync_handler+0x120/0x130\n [ 99.418788] el0t_64_sync+0x194/0x198\n [ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\n\nIssue is reproduced when generic_listxattr() returns \u0027system.nfs4_acl\u0027,\nthus calling lisxattr() with size = 16 will trigger the bug.\n\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size \u003e 0 and the return value is greater than size.",
"id": "GHSA-49g6-x26j-85g3",
"modified": "2024-06-26T00:31:37Z",
"published": "2024-04-17T12:32:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26870"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.