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CVE-2021-47563— ice: avoid bpf_prog refcount underflow

EPSS 0.03% · P10

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxefc2214b6047b6f5b4ca53151eba62521b9452d6< e65a8707b4cd756d26d246bb2b9fab06eebafac1affected
efc2214b6047b6f5b4ca53151eba62521b9452d6< 1f10b09ccc832698ef4624a6ab9a213b6ccbda76affected
efc2214b6047b6f5b4ca53151eba62521b9452d6< f65ee535df775a13a1046c0a0b2d72db342f8a5baffected
5.5affected
< 5.5unaffected
5.10.83≤ 5.10.*unaffected
5.15.6≤ 5.15.*unaffected
5.16≤ *unaffected
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I. Basic Information for CVE-2021-47563

Vulnerability Information
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Vulnerability Title
ice: avoid bpf_prog refcount underflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ice: avoid bpf_prog refcount underflow Ice driver has the routines for managing XDP resources that are shared between ndo_bpf op and VSI rebuild flow. The latter takes place for example when user changes queue count on an interface via ethtool's set_channels(). There is an issue around the bpf_prog refcounting when VSI is being rebuilt - since ice_prepare_xdp_rings() is called with vsi->xdp_prog as an argument that is used later on by ice_vsi_assign_bpf_prog(), same bpf_prog pointers are swapped with each other. Then it is also interpreted as an 'old_prog' which in turn causes us to call bpf_prog_put on it that will decrement its refcount. Below splat can be interpreted in a way that due to zero refcount of a bpf_prog it is wiped out from the system while kernel still tries to refer to it: [ 481.069429] BUG: unable to handle page fault for address: ffffc9000640f038 [ 481.077390] #PF: supervisor read access in kernel mode [ 481.083335] #PF: error_code(0x0000) - not-present page [ 481.089276] PGD 100000067 P4D 100000067 PUD 1001cb067 PMD 106d2b067 PTE 0 [ 481.097141] Oops: 0000 [#1] PREEMPT SMP PTI [ 481.101980] CPU: 12 PID: 3339 Comm: sudo Tainted: G OE 5.15.0-rc5+ #1 [ 481.110840] Hardware name: Intel Corp. GRANTLEY/GRANTLEY, BIOS GRRFCRB1.86B.0276.D07.1605190235 05/19/2016 [ 481.122021] RIP: 0010:dev_xdp_prog_id+0x25/0x40 [ 481.127265] Code: 80 00 00 00 00 0f 1f 44 00 00 89 f6 48 c1 e6 04 48 01 fe 48 8b 86 98 08 00 00 48 85 c0 74 13 48 8b 50 18 31 c0 48 85 d2 74 07 <48> 8b 42 38 8b 40 20 c3 48 8b 96 90 08 00 00 eb e8 66 2e 0f 1f 84 [ 481.148991] RSP: 0018:ffffc90007b63868 EFLAGS: 00010286 [ 481.155034] RAX: 0000000000000000 RBX: ffff889080824000 RCX: 0000000000000000 [ 481.163278] RDX: ffffc9000640f000 RSI: ffff889080824010 RDI: ffff889080824000 [ 481.171527] RBP: ffff888107af7d00 R08: 0000000000000000 R09: ffff88810db5f6e0 [ 481.179776] R10: 0000000000000000 R11: ffff8890885b9988 R12: ffff88810db5f4bc [ 481.188026] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 481.196276] FS: 00007f5466d5bec0(0000) GS:ffff88903fb00000(0000) knlGS:0000000000000000 [ 481.205633] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 481.212279] CR2: ffffc9000640f038 CR3: 000000014429c006 CR4: 00000000003706e0 [ 481.220530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 481.228771] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 481.237029] Call Trace: [ 481.239856] rtnl_fill_ifinfo+0x768/0x12e0 [ 481.244602] rtnl_dump_ifinfo+0x525/0x650 [ 481.249246] ? __alloc_skb+0xa5/0x280 [ 481.253484] netlink_dump+0x168/0x3c0 [ 481.257725] netlink_recvmsg+0x21e/0x3e0 [ 481.262263] ____sys_recvmsg+0x87/0x170 [ 481.266707] ? __might_fault+0x20/0x30 [ 481.271046] ? _copy_from_user+0x66/0xa0 [ 481.275591] ? iovec_from_user+0xf6/0x1c0 [ 481.280226] ___sys_recvmsg+0x82/0x100 [ 481.284566] ? sock_sendmsg+0x5e/0x60 [ 481.288791] ? __sys_sendto+0xee/0x150 [ 481.293129] __sys_recvmsg+0x56/0xa0 [ 481.297267] do_syscall_64+0x3b/0xc0 [ 481.301395] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 481.307238] RIP: 0033:0x7f5466f39617 [ 481.311373] Code: 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb bd 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 [ 481.342944] RSP: 002b:00007ffedc7f4308 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 481.361783] RAX: ffffffffffffffda RBX: 00007ffedc7f5460 RCX: 00007f5466f39617 [ 481.380278] RDX: 0000000000000000 RSI: 00007ffedc7f5360 RDI: 0000000000000003 [ 481.398500] RBP: 00007ffedc7f53f0 R08: 0000000000000000 R09: 000055d556f04d50 [ 481.416463] R10: 0000000000000077 R11: 0000000000000246 R12: 00007ffedc7f5360 [ 481.434131] R13: 00007ffedc7f5350 R14: 00007ffedc7f5344 R15: 0000000000000e98 [ 481.451520] Modules linked in: ice ---truncated---
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于引用计数下溢。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux efc2214b6047b6f5b4ca53151eba62521b9452d6 ~ e65a8707b4cd756d26d246bb2b9fab06eebafac1 -
LinuxLinux 5.5 -

II. Public POCs for CVE-2021-47563

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III. Intelligence Information for CVE-2021-47563

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Other References for CVE-2021-47563 (3)

Same Patch Batch · Linux · 2024-05-24 · 73 CVEs total

CVE-2021-47547net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound
CVE-2021-47569io_uring: fail cancellation for EXITING tasks
CVE-2021-47567powerpc/32: Fix hardlockup on vmap stack overflow
CVE-2021-47555net: vlan: fix underflow for the real_dev refcnt
CVE-2021-47553sched/scs: Reset task stack state in bringup_cpu()
CVE-2021-47551drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
CVE-2021-47552blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()
CVE-2021-47550drm/amd/amdgpu: fix potential memleak
CVE-2021-47548ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst
CVE-2021-47549sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl
CVE-2021-47554vdpa_sim: avoid putting an uninitialized iova_domain
CVE-2021-47546ipv6: fix memory leak in fib6_rule_suppress
CVE-2021-47544tcp: fix page frag corruption on page fault
CVE-2021-47542net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings()
CVE-2021-47541net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()
CVE-2021-47540mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode
CVE-2021-47539rxrpc: Fix rxrpc_peer leak in rxrpc_look_up_bundle()
CVE-2021-47538rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()
CVE-2021-47536net/smc: fix wrong list_del in smc_lgr_cleanup_early
CVE-2021-47537octeontx2-af: Fix a memleak bug in rvu_mbox_init()

Showing top 20 of 73 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47563

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