Linux Kernel up to 7.1.8 ATM net/atm vcc_setsockopt out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k2.16

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.1.182/6.6.151/6.12.103/6.18.44/7.1.8 and classified as critical. Impacted is the function vcc_setsockopt of the file net/atm of the component ATM. Performing a manipulation results in out-of-bounds. This vulnerability is cataloged as CVE-2026-74689. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.1.182/6.6.151/6.12.103/6.18.44/7.1.8. This affects the function vcc_setsockopt of the file net/atm of the component ATM. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net/atm: fix slab-out-of-bounds read in vcc_setsockopt() vcc_setsockopt() contained an ineffective optlen check: if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) return -EINVAL; If __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller passed a mismatched level), the length check optlen != __SO_SIZE(optname) was short-circuited and bypassed. Execution then fell through to switch(optname), calling copy_from_sockptr() assuming optval contained sufficient space. Furthermore, even if level matched, a cgroup BPF setsockopt filter could shrink optlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(), this leads to a KASAN slab-out-of-bounds read when optlen is smaller than the expected structure size. Fix this by using copy_safe_from_sockptr(), which unconditionally validates that optlen is at least the expected size before copying. Also change the local 'value' variable type from 'unsigned long' to 'int' so that SO_SETCLP matches its sizeof(int) ABI encoding on 64-bit systems.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-74689 since 08/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/22/2026).

Upgrading to version 6.1.183, 6.6.152, 6.12.104, 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch b3bcd5d65ac03c15787b2a5b36c718e26a689336/35f258fee9ed358c6d0f57f91c30bf029c3724af/6eb6af88710977eb529b558a07294874d8c40c4d/9f77c1ab382188f5b51982fab6d913443b6dc59f/2c5988c7349c0b64a7e0441bfc6e1dca54f7116a/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.183/6.6.152/6.12.104/6.18.45/7.1.9
Patch: b3bcd5d65ac03c15787b2a5b36c718e26a689336/35f258fee9ed358c6d0f57f91c30bf029c3724af/6eb6af88710977eb529b558a07294874d8c40c4d/9f77c1ab382188f5b51982fab6d913443b6dc59f/2c5988c7349c0b64a7e0441bfc6e1dca54f7116a/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/22/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74689 (🔒)
GCVE (CVE): GCVE-0-2026-74689
GCVE (VulDB): GCVE-100-394509

Entryinfo

Created: 08/22/2026 19:10
Changes: 08/22/2026 19:10 (60)
Complete: 🔍
Cache ID: 216::103

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