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CVE-2021-47521— can: sja1000: fix use after free in ems_pcmcia_add_card()

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，该漏洞源于存在释放后重用。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fd734c6f25aea4b2b44b045e489aec67b388577e< cbd86110546f7f730a1f5d7de56c944a336c15c4 affected
fd734c6f25aea4b2b44b045e489aec67b388577e< 1dd5b819f7e406dc15bbc7670596ff25261aaa2a affected
fd734c6f25aea4b2b44b045e489aec67b388577e< c8718026ba287168ff9ad0ccc4f9a413062cba36 affected
fd734c6f25aea4b2b44b045e489aec67b388577e< ccf070183e4655824936c0f96c4a2bcca93419aa affected
fd734c6f25aea4b2b44b045e489aec67b388577e< 1a295fea90e1acbe80c6d4940f5ff856edcd6bec affected
fd734c6f25aea4b2b44b045e489aec67b388577e< 923f4dc5df679f678e121c20bf2fd70f7bf3e288 affected
fd734c6f25aea4b2b44b045e489aec67b388577e< 474f9a8534f5f89841240a7e978bafd6e1e039ce affected
fd734c6f25aea4b2b44b045e489aec67b388577e< 3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45 affected
… +10 more rows
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I. Basic Information for CVE-2021-47521

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
can: sja1000: fix use after free in ems_pcmcia_add_card()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately, we can just use "pdev->irq" instead. Also we should check if at least one channel was set up.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于存在释放后重用。
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 fd734c6f25aea4b2b44b045e489aec67b388577e ~ cbd86110546f7f730a1f5d7de56c944a336c15c4 -
Linux Linux 3.2 -

II. Public POCs for CVE-2021-47521

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III. Intelligence Information for CVE-2021-47521

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Other References for CVE-2021-47521 (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-2021-47520 8.8 HIGH can: pch_can: pch_can_rx_normal: fix use after free
CVE-2021-47555 7.8 HIGH net: vlan: fix underflow for the real_dev refcnt
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-2021-47512 7.8 HIGH net/sched: fq_pie: prevent dismantle issue
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-2023-52880 7.8 HIGH tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc
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-2021-47541 7.8 HIGH net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()
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-2021-47570 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-2021-47521

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