Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: drop all currently...
In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: drop all currently held locks if deadlock happens
If vc4_hdmi_reset_link() returns -EDEADLK, it means that a deadlock
happened in the locking context. This situation should be addressed by
dropping all currently held locks and block until the contended lock
becomes available. Currently, vc4 is not dealing with the deadlock
properly, producing the following output when PROVE_LOCKING is enabled:
[ 825.612809] ------------[ cut here ]------------
[ 825.612852] WARNING: CPU: 1 PID: 116 at drivers/gpu/drm/drm_modeset_lock.c:276 drm_modeset_drop_locks+0x60/0x68 [drm]
[ 825.613458] Modules linked in: 8021q mrp garp stp llc
raspberrypi_cpufreq brcmfmac brcmutil crct10dif_ce hci_uart cfg80211
btqca btbcm bluetooth vc4 raspberrypi_hwmon snd_soc_hdmi_codec cec
clk_raspberrypi ecdh_generic drm_display_helper ecc rfkill
drm_dma_helper drm_kms_helper pwm_bcm2835 bcm2835_thermal bcm2835_rng
rng_core i2c_bcm2835 drm fuse ip_tables x_tables ipv6
[ 825.613735] CPU: 1 PID: 116 Comm: kworker/1:2 Tainted: G W 6.1.0-rc6-01399-g941aae326315 #3
[ 825.613759] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)
[ 825.613777] Workqueue: events output_poll_execute [drm_kms_helper]
[ 825.614038] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 825.614063] pc : drm_modeset_drop_locks+0x60/0x68 [drm]
[ 825.614603] lr : drm_helper_probe_detect+0x120/0x1b4 [drm_kms_helper]
[ 825.614829] sp : ffff800008313bf0
[ 825.614844] x29: ffff800008313bf0 x28: ffffcd7778b8b000 x27: 0000000000000000
[ 825.614883] x26: 0000000000000001 x25: 0000000000000001 x24: ffff677cc35c2758
[ 825.614920] x23: ffffcd7707d01430 x22: ffffcd7707c3edc7 x21: 0000000000000001
[ 825.614958] x20: 0000000000000000 x19: ffff800008313c10 x18: 000000000000b6d3
[ 825.614995] x17: ffffcd777835e214 x16: ffffcd7777cef870 x15: fffff81000000000
[ 825.615033] x14: 0000000000000000 x13: 0000000000000099 x12: 0000000000000002
[ 825.615070] x11: 72917988020af800 x10: 72917988020af800 x9 : 72917988020af800
[ 825.615108] x8 : ffff677cc665e0a8 x7 : d00a8c180000110c x6 : ffffcd77774c0054
[ 825.615145] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
[ 825.615181] x2 : ffff677cc55e1880 x1 : ffffcd7777cef8ec x0 : ffff800008313c10
[ 825.615219] Call trace:
[ 825.615232] drm_modeset_drop_locks+0x60/0x68 [drm]
[ 825.615773] drm_helper_probe_detect+0x120/0x1b4 [drm_kms_helper]
[ 825.616003] output_poll_execute+0xe4/0x224 [drm_kms_helper]
[ 825.616233] process_one_work+0x2b4/0x618
[ 825.616264] worker_thread+0x24c/0x464
[ 825.616288] kthread+0xec/0x110
[ 825.616310] ret_from_fork+0x10/0x20
[ 825.616335] irq event stamp: 7634
[ 825.616349] hardirqs last enabled at (7633): [] _raw_spin_unlock_irq+0x3c/0x78
[ 825.616384] hardirqs last disabled at (7634): [] __schedule+0x134/0x9f0
[ 825.616411] softirqs last enabled at (7630): [] local_bh_enable+0x4/0x30 [ipv6]
[ 825.617019] softirqs last disabled at (7618): [] local_bh_disable+0x4/0x30 [ipv6]
[ 825.617586] ---[ end trace 0000000000000000 ]---
Therefore, deal with the deadlock as suggested by [1], using the
function drm_modeset_backoff().
[1] https://docs.kernel.org/gpu/drm-kms.html?highlight=kms#kms-locking
Impact
CVE-2023-53455 has a CVSS score of 5.5 (Medium). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2023-53455? CVE-2023-53455 is a medium-severity security vulnerability. No fixed version is listed yet.
- How severe is CVE-2023-53455? CVE-2023-53455 has a CVSS score of 5.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Is there a fix for CVE-2023-53455? No fixed version is listed for CVE-2023-53455 yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is CVE-2023-53455 exploitable, and should I be worried? Whether CVE-2023-53455 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-53455 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.