CVE-2021-47013— net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
Affected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< c7f75d11fe72913d2619f97b2334b083cd7bb955 | affected |
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< dc1b438a35773d030be0ee80d9c635c3e558a322 | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< 16d8c44be52e3650917736d45f5904384a9da834 | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< 55fcdd1258faaecca74b91b88cc0921f9edd775d | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< 9dc373f74097edd0e35f3393d6248eda8d1ba99d | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< 8c06f34785068b87e2b560534c77c163d6c6dca7 | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< e407495ba6788a67d1bd41714158c079e340879b | affected | ||
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf< 6d72e7c767acbbdd44ebc7d89c6690b405b32b57 | affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2021-47013
Vulnerability Information
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Vulnerability Title
net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
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 emac_mac_tx_buf_send 中存在释放后的重用。
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
II. Public POCs for CVE-2021-47013
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|---|
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Other References for CVE-2021-47013 (7)
Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total
| CVE-2021-46995 | can: mcp251xfd: mcp251xfd_probe(): fix an error pointer dereference in probe | |
| CVE-2021-46998 | ethernet:enic: Fix a use after free bug in enic_hard_start_xmit | |
| CVE-2021-46999 | sctp: do asoc update earlier in sctp_sf_do_dupcook_a | |
| CVE-2021-47001 | xprtrdma: Fix cwnd update ordering | |
| CVE-2021-47004 | f2fs: fix to avoid touching checkpointed data in get_victim() | |
| CVE-2021-47003 | dmaengine: idxd: Fix potential null dereference on pointer status | |
| CVE-2021-47005 | PCI: endpoint: Fix NULL pointer dereference for ->get_features() | |
| CVE-2021-47007 | f2fs: fix panic during f2fs_resize_fs() | |
| CVE-2021-47006 | ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook | |
| CVE-2021-47002 | SUNRPC: Fix null pointer dereference in svc_rqst_free() | |
| CVE-2021-46997 | arm64: entry: always set GIC_PRIO_PSR_I_SET during entry | |
| CVE-2021-46996 | netfilter: nftables: Fix a memleak from userdata error path in new objects | |
| CVE-2021-46994 | can: mcp251x: fix resume from sleep before interface was brought up | |
| CVE-2021-46992 | netfilter: nftables: avoid overflows in nft_hash_buckets() | |
| CVE-2021-46993 | sched: Fix out-of-bound access in uclamp | |
| CVE-2021-46990 | powerpc/64s: Fix crashes when toggling entry flush barrier | |
| CVE-2021-46991 | i40e: Fix use-after-free in i40e_client_subtask() | |
| CVE-2021-46989 | hfsplus: prevent corruption in shrinking truncate | |
| CVE-2021-46987 | btrfs: fix deadlock when cloning inline extents and using qgroups | |
| CVE-2021-46988 | userfaultfd: release page in error path to avoid BUG_ON |
Showing top 20 of 86 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-53366
ipv4: account for fraggap on the paged allocation path - CVE-2026-53365
vsock/virtio: fix zerocopy completion for multi-skb sends - CVE-2026-53364
Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate - CVE-2026-53363
xfrm: iptfs: preserve shared-frag marker in iptfs_consume_fr - CVE-2026-53362
ipv6: account for fraggap on the paged allocation path
Same vendor: Linux
- CVE-2026-53366
ipv4: account for fraggap on the paged allocation path - CVE-2026-53365
vsock/virtio: fix zerocopy completion for multi-skb sends - CVE-2026-53364
Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate - CVE-2026-53363
xfrm: iptfs: preserve shared-frag marker in iptfs_consume_fr - CVE-2026-53362
ipv6: account for fraggap on the paged allocation path
V. Comments for CVE-2021-47013
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