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CVE-2022-2639 is an integer coercion/underflow flaw in the Linux kernel Open vSwitch module's reserve_sfa_size() function. While creating a flow containing a sufficiently large number of actions, the calculation can cause next_offset to exceed MAX_ACTIONS_BUFSIZE. Rather than returning -EMSGSIZE, the vulnerable path allocates only MAX_ACTIONS_BUFSIZE bytes while increasing actions_len by the larger requested size. Subsequent action-copy operations can therefore write beyond the allocated action buffer.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a local privilege escalation exploit for CVE-2022-2639, a vulnerability in the Linux kernel's Open vSwitch module. The exploit leverages a pipe-primitive technique to achieve an out-of-bounds write in kernel memory, ultimately allowing the attacker to overwrite the /usr/bin/mount binary with a SUID shell. The exploit does not require bypassing KASLR, SMAP, SMEP, or KPTI, making it effective on a wide range of kernel configurations. The repository includes two main C files: 'exploit.c', which is the full exploit that achieves root by overwriting /usr/bin/mount, and 'poc.c', which is a proof-of-concept for triggering the vulnerability. The Makefile provides build instructions for both binaries. The exploit is operational and has been tested on multiple kernel versions (5.13, 5.4, 4.18). The main attack vector is local, requiring the attacker to execute code on the target system. The only fingerprintable endpoint is the file path '/usr/bin/mount', which is overwritten during exploitation.
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18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel Open vSwitch integer-underflow vulnerability resulting in an out-of-bounds write.
Linux kernel Open vSwitch integer-underflow vulnerability resulting in an out-of-bounds write.
Linux kernel Open vSwitch integer-underflow vulnerability causing an out-of-bounds write.
Linux kernel Open vSwitch integer underflow causing an out-of-bounds write in reserve_sfa_size().
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.