| Name | CVE-2023-4921 |
| Description | A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3623-1, DLA-3710-1, ELA-1034-1, ELA-991-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | jessie, jessie (lts) | 3.16.84-1 | vulnerable |
| stretch (security) | 4.9.320-2 | vulnerable | |
| stretch (lts), stretch | 4.9.320-3 | vulnerable | |
| buster (security), buster, buster (lts) | 4.19.316-1 | fixed | |
| bullseye | 5.10.223-1 | fixed | |
| bullseye (security) | 5.10.226-1 | fixed | |
| bookworm | 6.1.115-1 | fixed | |
| bookworm (security) | 6.1.112-1 | fixed | |
| trixie | 6.11.7-1 | fixed | |
| sid | 6.11.9-1 | fixed | |
| linux-4.19 (PTS) | jessie, jessie (lts) | 4.19.316-1~deb8u1 | fixed |
| stretch (security) | 4.19.232-1~deb9u1 | vulnerable | |
| stretch (lts), stretch | 4.19.316-1~deb9u1 | fixed | |
| linux-5.10 (PTS) | jessie, jessie (lts) | 5.10.226-1~deb8u1 | fixed |
| stretch (lts), stretch | 5.10.226-1~deb9u1 | fixed | |
| buster, buster (lts) | 5.10.226-1~deb10u1 | fixed | |
| buster (security) | 5.10.218-1~deb10u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | jessie | (unfixed) | end-of-life | ||
| linux | source | stretch | (unfixed) | end-of-life | ||
| linux | source | buster | 4.19.304-1 | DLA-3710-1 | ||
| linux | source | bullseye | 5.10.197-1 | |||
| linux | source | bookworm | 6.1.55-1 | |||
| linux | source | (unstable) | 6.5.6-1 | |||
| linux-4.19 | source | jessie | 4.19.304-1~deb8u1 | ELA-1034-1 | ||
| linux-4.19 | source | stretch | 4.19.304-1~deb9u1 | ELA-1034-1 | ||
| linux-5.10 | source | jessie | 5.10.197-1~deb8u1 | ELA-991-1 | ||
| linux-5.10 | source | stretch | 5.10.197-1~deb9u1 | ELA-991-1 | ||
| linux-5.10 | source | buster | 5.10.197-1~deb10u1 | DLA-3623-1 |
https://kernel.dance/#8fc134fee27f2263988ae38920bc03da416b03d8
https://git.kernel.org/linus/8fc134fee27f2263988ae38920bc03da416b03d8 (6.6-rc1)