drm: Don't unref the same fb many times by mistake due to deadlock handling
Priority LOW 34CWE-667Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 17 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0023 13th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.19.307, 5.4.269, 5.10.210 +5Red Hat: 6 advisoriesRed Hat: 17 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.12 and later | 4.19.307, 5.4.269, 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3, 6.8 | Patch available | CNA |
- Linux VendorLinux Affected 4.12 and later Fixed in 4.19.307, 5.4.269, 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3, 6.8 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 4.19.307; 4.20 to before 5.4.269; 5.5 to before 5.10.210; 5.11 to before 5.15.149; 5.16 to before 6.1.76; 6.2 to before 6.6.15; 6.7 to before 6.7.3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.19.307; 4.20 to before 5.4.269; 5.5 to before 5.10.210; 5.11 to before 5.15.149; 5.16 to before 6.1.76; 6.2 to before 6.6.15; 6.7 to before 6.7.3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.19.307, 5.4.269, 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3, 6.8
Red Hat 6 advisories
- RHSA-2024:9315 Released 2024-11-12 · Red Hat rating Moderatekernel security update
- Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers-5.14.0-503.11.1.el9_5, kernel-tools-libs-devel-5.14.0-503.11.1.el9_5, libperf-5.14.0-503.11.1.el9_5
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-503.11.1.el9_5, kernel-64k-debug-devel-matched-5.14.0-503.11.1.el9_5, kernel-64k-devel-5.14.0-503.11.1.el9_5 +12
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.4.0-503.11.1.el9_5, kernel-5.14.0-503.11.1.el9_5, kernel-64k-5.14.0-503.11.1.el9_5 +30
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +9
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +11
- RHSA-2024:6206 Released 2024-09-03 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-tools-libs-devel-4.18.0-477.70.1.el8_8
- Red Hat Enterprise Linux BaseOS EUS (v.8.8) bpftool-4.18.0-477.70.1.el8_8, kernel-4.18.0-477.70.1.el8_8, kernel-abi-stablelists-4.18.0-477.70.1.el8_8 +19
- RHSA-2024:5101 Released 2024-08-08 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.16.1.el8_10, kernel-4.18.0-553.16.1.el8_10, kernel-abi-stablelists-4.18.0-553.16.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.16.1.el8_10
Show 3 more Red Hat advisories
- RHSA-2024:5102 Released 2024-08-08 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-4.18.0-553.16.1.rt7.357.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-core-4.18.0-553.16.1.rt7.357.el8_10, kernel-rt-debug-4.18.0-553.16.1.rt7.357.el8_10 +7
- RHSA-2024:5065 Released 2024-08-07 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +14
- RHSA-2024:2394 Released 2024-04-30 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-427.13.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.13.1.el9_4, kernel-64k-devel-5.14.0-427.13.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.3.0-427.13.1.el9_4, kernel-5.14.0-427.13.1.el9_4, kernel-64k-5.14.0-427.13.1.el9_4 +29
- Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-427.13.1.el9_4, libperf-5.14.0-427.13.1.el9_4
- Red Hat Enterprise Linux NFV (v. 9) kernel-rt-5.14.0-427.13.1.el9_4, kernel-rt-core-5.14.0-427.13.1.el9_4, kernel-rt-debug-5.14.0-427.13.1.el9_4 +11
- Red Hat Enterprise Linux RT (v. 9) kernel-rt-5.14.0-427.13.1.el9_4, kernel-rt-core-5.14.0-427.13.1.el9_4, kernel-rt-debug-5.14.0-427.13.1.el9_4 +9
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat CodeReady Linux Builder EUS (v.8.8) | Fixed | RHSA-2024:6206 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:2394, RHSA-2024:9315 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2024:5101 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2024:2394, RHSA-2024:9315 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2024:5065 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2024:5065 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.8) | Fixed | RHSA-2024:6206 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2024:5065 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:5101 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:2394 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2024:5102 |
| Red Hat Enterprise Linux NFV (v. 9) | Fixed | RHSA-2024:2394 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2024:5102 |
| Red Hat Enterprise Linux RT (v. 9) | Fixed | RHSA-2024:2394 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2024:9315 |
Not affected: 3 products
- Red Hat CodeReady Linux Builder (v. 9)
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux AppStream (v. 9)
Timeline
- 2026-10-02 Threatist record created from CVE-2023-52486
- 2026-10-03 Alias added: GHSA-ph55-5xqf-59r7
- 2026-10-29 Affected versions changed · Red Hat
References
Patch 8
- https://git.kernel.org/stable/c/376e21a9e4c2c63ee5d8d3aa74be5082c3882229
- https://git.kernel.org/stable/c/9dd334a8245011ace45e53298175c7b659edb3e7
- https://git.kernel.org/stable/c/f55261469be87c55df13db76dc945f6bcd825105
- https://git.kernel.org/stable/c/b4af63da9d94986c529d74499fdfe44289acd551
- https://git.kernel.org/stable/c/62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0
- https://git.kernel.org/stable/c/d7afdf360f4ac142832b098b4de974e867cc063c
- https://git.kernel.org/stable/c/bfd0feb1b109cb63b87fdcd00122603787c75a1a
- https://git.kernel.org/stable/c/cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c
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Sources
- CVE-2023-52486 · CVE Program
- CVE-2023-52486 · NVD
- FIRST EPSS
- GHSA-ph55-5xqf-59r7 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-52486 · Red Hat security data · CC BY 4.0
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