CVE-2022-49326: rtl818x: Prevent using not initialized queues
Vulnerability summary
CVE-2022-49326 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: rtl818x: Prevent using not initialized queues Using not existing queues can panic the kernel with rtl8180/rtl8185 cards. Ignore the skb priority for those cards, they only have one tx queue. Pierre Asselin (pa@panix.com) reported the kernel crash in the Gentoo forum: https://forums.gentoo.org/viewtopic-t-1147832-postdays-0-postorder-asc-start-25.html He also confirmed that this patch fixes the issue. In summary this happened: After updating wpa_supplicant from 2.9 to 2.10 the kernel crashed with a "divide error: 0000" when connecting to an AP. Control port tx now tries to use IEEE80211_AC_VO for the priority, which wpa_supplicants starts to use in 2.10. Since only the rtl8187se part of the driver supports QoS, the priority of the skb is set to IEEE80211_AC_BE (2) by mac80211 for rtl8180/rtl8185 cards. rtl8180 is then unconditionally reading out the priority and finally crashes on drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c line 544 without this patch: idx = (ring->idx + skb_queue_len(&ring->queue)) % ring->entries "ring->entries" is zero for rtl8180/rtl8185 cards, tx_ring[2] never got initialized.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.30% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu112 products
- linuxAll versions (No fix recorded) | < 4.15.0-192.203 | < 5.4.0-126.142 | < 5.15.0-47.51
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1140.151 | < 5.4.0-1085.92 | < 5.15.0-1019.23
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < b5dca2cd3f0239512da808598b4e70557eb4c2a1 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < d7e30dfc166d33470bba31a42f9bbc346e5409d5 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 9d5e96cc1f1720019ce27b127a31695148d38bb0 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < b8ce58ab80faaea015c206382041ff3bcf5495ff | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 769ec2a824deae2f1268dfda14999a4d14d0d0c5 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 6ad81ad0cf5744738ce94c8e64051ddd80a1734c | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 9ad1981fc4de3afb7db3e8eb5a6a52d4c7d0d577 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 98e55b0b876bde3353f4e074883d66ecb55c65a3 | ≥ fd6564fcdc0bfcd432e6e939f9538acc3905d08a, < 746285cf81dc19502ab238249d75f5990bd2d231 | 3.15
- linux_kernel< 4.9.318 | ≥ 4.10, < 4.14.283 | ≥ 4.15, < 4.19.247 | ≥ 4.20, < 5.4.198 | ≥ 5.5, < 5.10.121 | ≥ 5.11, < 5.15.46 | ≥ 5.16, < 5.17.14 | ≥ 5.18, < 5.18.3
Debian1 product
- linux< 5.18.5-1
3 vendors · 115 products
