CVE-2025-68339atm/fore200e: Fix possible data race in fore200e_open()
- —Not scoredno CVSS score yet
- 0.19%Exploitation in 30 daysEPSS · top 91% 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: atm/fore200e: Fix possible data race in fore200e_open() Protect access to fore200e->available_cell_rate with rate_mtx lock in the error handling path of fore200e_open() to prevent a data race. The field fore200e->available_cell_rate is a shared resource used to track available bandwidth. It is concurrently accessed by fore200e_open(), fore200e_close(), and fore200e_change_qos(). In fore200e_open(), the lock rate_mtx is correctly held when subtracting vcc->qos.txtp.max_pcr from available_cell_rate to reserve bandwidth. However, if the subsequent call to fore200e_activate_vcin() fails, the function restores the reserved bandwidth by adding back to available_cell_rate without holding the lock. This introduces a race condition because available_cell_rate is a global device resource shared across all VCCs. If the error path in fore200e_open() executes concurrently with operations like fore200e_close() or fore200e_change_qos() on other VCCs, a read-modify-write race occurs. Specifically, the error path reads the rate without the lock. If another CPU acquires the lock and modifies the rate (e.g., releasing bandwidth in fore200e_close()) between this read and the subsequent write, the error path will overwrite the concurrent update with a stale value. This results in incorrect bandwidth accounting.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 5 months later
· 5 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < bd1415efbab507b9b995918105eef953013449dd
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 9917ba597cf95f307778e495f71ff25a5064d167
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 667ac868823224374f819500adc5baa2889c7bc5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6610361458e7eb6502dd3182f586f91fcc218039
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 82fca3d8a4a34667f01ec2351a607135249c9cff
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.119 – ≤ 6.6.*
- unaffected 6.12.61 – ≤ 6.12.*
- unaffected 6.17.11 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References7
- https://git.kernel.org/stable/c/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d (opens in a new tab)
- https://git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd (opens in a new tab)
- https://git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1 (opens in a new tab)
- https://git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167 (opens in a new tab)
- https://git.kernel.org/stable/c/667ac868823224374f819500adc5baa2889c7bc5 (opens in a new tab)
- https://git.kernel.org/stable/c/6610361458e7eb6502dd3182f586f91fcc218039 (opens in a new tab)
- https://git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff (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-2025-204797 (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)
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[](https://cveledger.app/cve/CVE-2025-68339)Record last updated .