CVE-2024-35863: smb: client: fix potential UAF in is_valid_oplock_break()
Vulnerability summary
CVE-2024-35863 is a critical (CVSS 9.8) Use After Free vulnerability in linux. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 51.7% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 82 · Related 81Timeline
- 19-05-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in is_valid_oplock_break() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
0.66%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.66% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu93 products
- linux< 6.8.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1011.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 7f48558e6489d032b1584b0cc9ac4bb11072c034, < 494c91e1e9413b407d12166a61b84200d4d54fac | ≥ 7f48558e6489d032b1584b0cc9ac4bb11072c034, < 0a15ba88a32fa7a516aff7ffd27befed5334dff2 | ≥ 7f48558e6489d032b1584b0cc9ac4bb11072c034, < 16d58c6a7db5050b9638669084b63fc05f951825 | ≥ 7f48558e6489d032b1584b0cc9ac4bb11072c034, < 69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29 | a67172a013953664b1dad03c648200c70b90506c | ≥ 3.12.48, < 3.13 | 3.13
- linux_kernel≥ 6.0, < 6.1.85 | ≥ 6.2, < 6.6.26 | ≥ 6.7, < 6.8.5 | 6.9:rc1 | 6.9:rc2
Debian1 product
- linux< 6.1.85-1 | < 6.8.9-1
3 vendors · 96 products
