CVE-2024-43869perf: Fix event leak upon exec and file release
- 5.5MediumCVSS base score
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: perf: Fix event leak upon exec and file release The perf pending task work is never waited upon the matching event release. In the case of a child event, released via free_event() directly, this can potentially result in a leaked event, such as in the following scenario that doesn't even require a weak IRQ work implementation to trigger: schedule() prepare_task_switch() =======> <NMI> perf_event_overflow() event->pending_sigtrap = ... irq_work_queue(&event->pending_irq) <======= </NMI> perf_event_task_sched_out() event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount) task_work_add(&event->pending_task) finish_lock_switch() =======> <IRQ> perf_pending_irq() //do nothing, rely on pending task work <======= </IRQ> begin_new_exec() perf_event_exit_task() perf_event_exit_event() // If is child event free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // event is leaked Similar scenarios can also happen with perf_event_remove_on_exec() or simply against concurrent perf_event_release(). Fix this with synchonizing against the possibly remaining pending task work while freeing the event, just like is done with remaining pending IRQ work. This means that the pending task callback neither need nor should hold a reference to the event, preventing it from ever beeing freed.
Timeline
ID reserved
By Linux
- 4 days later
· 4 days later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8bffa95ac19ff27c8261904f89d36c7fcf215d59 – < 9ad46f1fef421d43cdab3a7d1744b2f43b54dae0
- affected 517e6a301f34613bff24a8e35b5455884f2d83d8 – < ed2c202dac55423a52d7e2290f2888bf08b8ee99
- affected 517e6a301f34613bff24a8e35b5455884f2d83d8 – < 104e258a004037bc7dba9f6085c71dad6af57ad4
- affected 517e6a301f34613bff24a8e35b5455884f2d83d8 – < f34d8307a73a18de5320fcc6f40403146d061891
- affected 517e6a301f34613bff24a8e35b5455884f2d83d8 – < 3a5465418f5fd970e86a86c7f4075be262682840
- affected 78e1317a174edbfd1182599bf76c092a2877672c
- affected 5.15.84 – < 5.15.165
- affected 6.0.14 – < 6.1
- affected 6.1
- unaffected < 6.1
- unaffected 5.15.165 – ≤ 5.15.*
- unaffected 6.1.103 – ≤ 6.1.*
- unaffected 6.6.44 – ≤ 6.6.*
- unaffected 6.10.3 – ≤ 6.10.*
- unaffected 6.11 – ≤ *
References
References6
- https://git.kernel.org/stable/c/9ad46f1fef421d43cdab3a7d1744b2f43b54dae0 (opens in a new tab)
- https://git.kernel.org/stable/c/ed2c202dac55423a52d7e2290f2888bf08b8ee99 (opens in a new tab)
- https://git.kernel.org/stable/c/104e258a004037bc7dba9f6085c71dad6af57ad4 (opens in a new tab)
- https://git.kernel.org/stable/c/f34d8307a73a18de5320fcc6f40403146d061891 (opens in a new tab)
- https://git.kernel.org/stable/c/3a5465418f5fd970e86a86c7f4075be262682840 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-40519 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-43869)Record last updated .