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Vulnerability · Published Mar 25, 2024 · Assigned by Linux

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

High 7.5

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 47.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.14.6-1DEBIAN-CVE-2021-47179
Debian:13linux5.14.6-1DEBIAN-CVE-2021-47179
Debian:14linux5.14.6-1DEBIAN-CVE-2021-47179
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47179
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47179
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47179

Affected products (as reported)

VendorProductVersions
Linux Linux 80e34f4957ec3010c85f9bb0b568a8d46acdf535 – before 4e1ba532dbc1a0e19fc2458d74ab8d98680c4e427b7b9774643220e53eef58c15bb29bd4182fe053 – before 42637ca25c7d7b5a92804a679af5192e8c1a9f489ffa7967f9379a0a1b924e9ffeda709d72237da7 – before 39785761feadf261bc5101372b0b0bbaf6a944946be0e4b59314e4a836495f6ffdc5d2c5b079deeb – before aba3c7795f51717ae316f3566442dee7cc3eeccb2fafe7d5047f98791afd9a1d90d2afb70debc590 – before f9890652185b72b8de9ebeb4406037640b6e1b537e65ea887d0c0997f3053acd91a027af45e71c5b – before b090d110e66636bca473fd8b98d5c97b555a965ade144ff4234f935bd2150108019b5d87a90a8a96 – before a421d218603ffa822a0b8045055c03eae394a7eb96260bde1ea8ae31a5402fe506abbb8951d5a42c
Linux Linux 4.9.269 – before 4.9.2714.14.233 – before 4.14.2354.19.191 – before 4.19.1935.4.118 – before 5.4.1245.10.36 – before 5.10.425.12.3 – before 5.12.9

References