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CVE-2021-47179— NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

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 NFSv4 中的 pnfs_mark_matching_lsegs_return()存在NULL 指针取消引用。

CVSS 7.5 · High EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 80e34f4957ec3010c85f9bb0b568a8d46acdf535< 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 affected
7b7b9774643220e53eef58c15bb29bd4182fe053< 42637ca25c7d7b5a92804a679af5192e8c1a9f48 affected
9ffa7967f9379a0a1b924e9ffeda709d72237da7< 39785761feadf261bc5101372b0b0bbaf6a94494 affected
6be0e4b59314e4a836495f6ffdc5d2c5b079deeb< aba3c7795f51717ae316f3566442dee7cc3eeccb affected
2fafe7d5047f98791afd9a1d90d2afb70debc590< f9890652185b72b8de9ebeb4406037640b6e1b53 affected
7e65ea887d0c0997f3053acd91a027af45e71c5b< b090d110e66636bca473fd8b98d5c97b555a965a affected
de144ff4234f935bd2150108019b5d87a90a8a96< a421d218603ffa822a0b8045055c03eae394a7eb affected
96260bde1ea8ae31a5402fe506abbb8951d5a42c affected
… +7 more rows
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I. Basic Information for CVE-2021-47179

Vulnerability Information
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Vulnerability Title
NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return() Commit de144ff4234f changes _pnfs_return_layout() to call pnfs_mark_matching_lsegs_return() passing NULL as the struct pnfs_layout_range argument. Unfortunately, pnfs_mark_matching_lsegs_return() doesn't check if we have a value here before dereferencing it, causing an oops. I'm able to hit this crash consistently when running connectathon basic tests on NFS v4.1/v4.2 against Ontap.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 NFSv4 中的 pnfs_mark_matching_lsegs_return()存在NULL 指针取消引用。
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 80e34f4957ec3010c85f9bb0b568a8d46acdf535 ~ 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42 -
Linux Linux 4.9.269 ~ 4.9.271 -

II. Public POCs for CVE-2021-47179

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III. Intelligence Information for CVE-2021-47179

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Other References for CVE-2021-47179 (7)

Same Patch Batch · Linux · 2024-03-25 · 40 CVEs total

CVE-2021-47137 9.8 CRITICAL net: lantiq: fix memory corruption in RX ring
CVE-2021-47168 9.8 CRITICAL NFS: fix an incorrect limit in filelayout_decode_layout()
CVE-2021-47162 9.8 CRITICAL tipc: skb_linearize the head skb when reassembling msgs
CVE-2021-47136 8.6 HIGH net: zero-initialize tc skb extension on allocation
CVE-2021-47160 8.1 HIGH net: dsa: mt7530: fix VLAN traffic leaks
CVE-2021-47142 7.8 HIGH drm/amdgpu: Fix a use-after-free
CVE-2021-47175 7.8 HIGH net/sched: fq_pie: fix OOB access in the traffic path
CVE-2021-47163 7.8 HIGH tipc: wait and exit until all work queues are done
CVE-2021-47159 7.8 HIGH net: dsa: fix a crash if ->get_sset_count() fails
CVE-2021-47158 7.8 HIGH net: dsa: sja1105: add error handling in sja1105_setup()
CVE-2021-47153 7.8 HIGH i2c: i801: Don't generate an interrupt on bus reset
CVE-2021-47152 7.8 HIGH mptcp: fix data stream corruption
CVE-2021-47148 7.8 HIGH octeontx2-pf: fix a buffer overflow in otx2_set_rxfh_context()
CVE-2021-47178 7.5 HIGH scsi: target: core: Avoid smp_processor_id() in preemptible code
CVE-2021-47166 NFS: Don't corrupt the value of pg_bytes_written in nfs_do_recoalesce()
CVE-2021-47180 NFC: nci: fix memory leak in nci_allocate_device
CVE-2021-47177 iommu/vt-d: Fix sysfs leak in alloc_iommu()
CVE-2021-47176 s390/dasd: add missing discipline function
CVE-2021-47141 gve: Add NULL pointer checks when freeing irqs.
CVE-2021-47174 netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check, fallback to non-AVX2 version

Showing top 20 of 40 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47179

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