571 lines
29 KiB
JSON
571 lines
29 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2025-21796",
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"dateReserved": "2024-12-29T08:45:45.768Z",
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"datePublished": "2025-02-27T02:18:32.191Z",
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clear acl_access/acl_default after releasing them\n\nIf getting acl_default fails, acl_access and acl_default will be released\nsimultaneously. However, acl_access will still retain a pointer pointing\nto the released posix_acl, which will trigger a WARNING in\nnfs3svc_release_getacl like this:\n\n------------[ cut here ]------------\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 26 PID: 3199 at lib/refcount.c:28\nrefcount_warn_saturate+0xb5/0x170\nModules linked in:\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb5/0x170\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff <0f> 0b eb\ncd 0f b6 1d 8a3\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\nFS: 0000000000000000(0000) GS:ffff88871ed00000(0000)\nknlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n ? refcount_warn_saturate+0xb5/0x170\n ? __warn+0xa5/0x140\n ? refcount_warn_saturate+0xb5/0x170\n ? report_bug+0x1b1/0x1e0\n ? handle_bug+0x53/0xa0\n ? exc_invalid_op+0x17/0x40\n ? asm_exc_invalid_op+0x1a/0x20\n ? tick_nohz_tick_stopped+0x1e/0x40\n ? refcount_warn_saturate+0xb5/0x170\n ? refcount_warn_saturate+0xb5/0x170\n nfs3svc_release_getacl+0xc9/0xe0\n svc_process_common+0x5db/0xb60\n ? __pfx_svc_process_common+0x10/0x10\n ? __rcu_read_unlock+0x69/0xa0\n ? __pfx_nfsd_dispatch+0x10/0x10\n ? svc_xprt_received+0xa1/0x120\n ? xdr_init_decode+0x11d/0x190\n svc_process+0x2a7/0x330\n svc_handle_xprt+0x69d/0x940\n svc_recv+0x180/0x2d0\n nfsd+0x168/0x200\n ? __pfx_nfsd+0x10/0x10\n kthread+0x1a2/0x1e0\n ? kthread+0xf4/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x60\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\nKernel panic - not syncing: kernel: panic_on_warn set ...\n\nClear acl_access/acl_default after posix_acl_release is called to prevent\nUAF from being triggered."
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"value": "AV:N - The vulnerable functions are the NFSACL sideband RPC handlers (program 100227, ACLPROC2/3_GETACL) served by the in-kernel nfsd on port 2049; a remote NFS client reaches them purely by sending a GETACL call with a filehandle and a mask.\nAC:L - The attacker fully controls the mask field that selects both the access and default ACL branches, and can retry indefinitely; the error condition is deterministic on FUSE-backed exports and on any file with a malformed/corrupt system.posix_acl_default xattr, and is otherwise reachable via the unlocked -ERANGE window in ext4_get_acl that the attacker drives from both sides with concurrent SETACL/GETACL.\nPR:N - NFS AUTH_SYS performs no real authentication — the client merely asserts a uid — and fh_verify() is called with NFSD_MAY_NOP, so nfsd_permission() returns 0 without any file ownership or mode check; any host permitted by the export list can issue GETACL against any object in the export.\nUI:N - The entire sequence is driven by attacker-sent RPC calls handled by the nfsd kernel threads; no action by a local user or administrator is required.\nS:U - The freed posix_acl, the dangling inode->i_acl, and the resulting corruption all reside in the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - In the NFSv2-ACL encoder the released posix_acl is still passed to nfs_stream_encode_acl(), which reads a_count and up to 1024 a_entries[] from the freed slab object and transmits them to the remote client, yielding freed-heap disclosure plus a large out-of-bounds read; the cached-ACL variant additionally leaves inode->i_acl dangling for later reads.\nI:H - The second posix_acl_release() performs an atomic decrement into freed (potentially reallocated) slab memory, and in the cached case the dangling inode->i_acl leads to refcount_inc on freed memory, a genuine double free on the next set/forget_cached_acl, and posix_acl_permission() making file access-control decisions from attacker-groomable freed heap contents.\nA:H - The bug reproduces as a refcount_t underflow WARN in nfs3svc_release_getacl (kernel panic with panic_on_warn, as shown in the commit's own report), and the use-after-free of a slab object causes further corruption and oopses; it is remotely and repeatedly triggerable."
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
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},
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
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{
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|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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]
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}
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]
|
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}
|
|
} |