In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)

The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-5663 advisory.

    - slcan: Don't transmit uninitialized stack data in padding (Richard Palethorpe)  [Orabug: 31136750]     {CVE-2020-11494}
    - blktrace: Protect q->blk_trace with RCU (Jan Kara)  [Orabug: 31123573]  {CVE-2019-19768}
    - floppy: check FDC index for errors before assigning it (Linus Torvalds)  [Orabug: 31067510]     {CVE-2020-9383}
    - vhost: Check docket sk_family instead of call getname (Eugenio Perez)  [Orabug: 31085989]     {CVE-2020-10942}
    - ext4: add cond_resched() to ext4_protect_reserved_inode (Shijie Luo)  [Orabug: 31067112]     {CVE-2020-8992}
    - bpf: Undo incorrect __reg_bound_offset32 handling (Daniel Borkmann)  [Orabug: 31127385]  {CVE-2020-8835}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The 5.5.16 stable kernel update contains a number of important fixes across the tree.

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The 5.5.15 stable kernel update contains a number of important fixes across the tree.

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The 5.5.13 stable kernel update contains a number of important fixes across the tree.

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The 5.5.11 stable kernel update contains a number of important fixes across the tree.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The 5.5.15 stable kernel update contains a number of important fixes across the tree.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4313-1 advisory.

    Manfred Paul discovered that the bpf verifier in the Linux kernel did not properly calculate register     bounds for certain operations. A local attacker could use this to expose sensitive information (kernel     memory) or gain administrative privileges.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
136022	Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2020-5663)	Nessus	Oracle Linux Local Security Checks	high
135598	Fedora 30 : kernel / kernel-headers / kernel-tools (2020-73c00eda1c)	Nessus	Fedora Local Security Checks	high
135260	Fedora 31 : kernel / kernel-headers / kernel-tools (2020-666f3b1ac3)	Nessus	Fedora Local Security Checks	high
135029	Ubuntu 18.04 LTS : Linux kernel vulnerability (USN-4313-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2020-8835

high

Tenable Plugins

high

high

high

high