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CVE-2021-47520— can: pch_can: pch_can_rx_normal: fix use after free

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 can:pch_can:pch_can_rx_normal 模块释放后重用。

CVSS 8.8 · High EPSS 0.34% · P26

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b21d18b51b31a24d17f883b678432fbdee3d5675< bafe343a885c70dddf358379cf0b2a1c07355d8d affected
b21d18b51b31a24d17f883b678432fbdee3d5675< 3a3c46e2eff0577454860a203be1a8295f4acb76 affected
b21d18b51b31a24d17f883b678432fbdee3d5675< affbad02bf80380a7403885b9fe4a1587d1bb4f3 affected
b21d18b51b31a24d17f883b678432fbdee3d5675< 3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa affected
b21d18b51b31a24d17f883b678432fbdee3d5675< abb4eff3dcd2e583060082a18a8dbf31f02689d4 affected
b21d18b51b31a24d17f883b678432fbdee3d5675< 703dde112021c93d6e89443c070e7dbd4dea612e affected
b21d18b51b31a24d17f883b678432fbdee3d5675< 6c73fc931658d8cbc8a1714b326cb31eb71d16a7 affected
b21d18b51b31a24d17f883b678432fbdee3d5675< 94cddf1e9227a171b27292509d59691819c458db affected
… +10 more rows
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I. Basic Information for CVE-2021-47520

Vulnerability Information
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Vulnerability Title
can: pch_can: pch_can_rx_normal: fix use after free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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 can:pch_can:pch_can_rx_normal 模块释放后重用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux b21d18b51b31a24d17f883b678432fbdee3d5675 ~ bafe343a885c70dddf358379cf0b2a1c07355d8d -
Linux Linux 2.6.37 -

II. Public POCs for CVE-2021-47520

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III. Intelligence Information for CVE-2021-47520

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Patches & Fixes for CVE-2021-47520 (1)

Other References for CVE-2021-47520 (7)

Same Patch Batch · Linux · 2024-05-24 · 72 CVEs total

CVE-2021-47544 9.8 CRITICAL tcp: fix page frag corruption on page fault
CVE-2021-47536 9.8 CRITICAL net/smc: fix wrong list_del in smc_lgr_cleanup_early
CVE-2021-47506 9.8 CRITICAL nfsd: fix use-after-free due to delegation race
CVE-2021-47541 7.8 HIGH net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()
CVE-2021-47512 7.8 HIGH net/sched: fq_pie: prevent dismantle issue
CVE-2021-47502 7.8 HIGH ASoC: codecs: wcd934x: handle channel mappping list correctly
CVE-2021-47505 7.8 HIGH aio: fix use-after-free due to missing POLLFREE handling
CVE-2021-47517 7.8 HIGH ethtool: do not perform operations on net devices being unregistered
CVE-2021-47561 7.8 HIGH i2c: virtio: disable timeout handling
CVE-2021-47555 7.8 HIGH net: vlan: fix underflow for the real_dev refcnt
CVE-2021-47551 7.8 HIGH drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
CVE-2021-47552 7.8 HIGH blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()
CVE-2021-47533 7.8 HIGH drm/vc4: kms: Clear the HVS FIFO commit pointer once done
CVE-2021-47535 7.8 HIGH drm/msm/a6xx: Allocate enough space for GMU registers
CVE-2021-47500 7.8 HIGH iio: mma8452: Fix trigger reference couting
CVE-2023-52880 7.8 HIGH tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc
CVE-2021-47515 7.5 HIGH seg6: fix the iif in the IPv6 socket control block
CVE-2021-47559 7.5 HIGH net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()
CVE-2021-47548 ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst
CVE-2021-47570 staging: r8188eu: fix a memory leak in rtw_wx_read32()

Showing top 20 of 72 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47520

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