RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt In rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the resp_pkts queue and then a decision is made whether to run the completer task inline or schedule it. Finally the skb is dereferenced to bump a 'hw' performance counter. This is wrong because if the completer task is already running in a separate thread it may have already processed the skb and freed it which can cause a seg fault. This has been observed infrequently in testing at high scale. This patch fixes this by changing the order of enqueuing the packet until after the counter is accessed.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
4.12
References 8
git.kernel.org
- stable/c/c91fb72a2ca6480d8d77262eef52dc5b178463a3
- stable/c/de5a059e36657442b5637cc16df5163e435b9cb4
- stable/c/e0e14dd35d4242340c7346aac60c7ff8fbf87ffc
- stable/c/faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19
- stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794
- stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc
- stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb
- stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6