CVE-2024-36883

net: fix out-of-bounds access in ops_init

State: Published
Severity: 7.8 High
Published: May 30, 2024
Updated: Aug 5, 2026
Reserved: May 30, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

net: fix out-of-bounds access in ops_init

net_alloc_generic is called by net_alloc, which is called without any locking. It reads max_gen_ptrs, which is changed under pernet_ops_rwsem. It is read twice, first to allocate an array, then to set s.len, which is later used to limit the bounds of the array access.

It is possible that the array is allocated and another thread is registering a new pernet ops, increments max_gen_ptrs, which is then used to set s.len with a larger than allocated length for the variable array.

Fix it by reading max_gen_ptrs only once in net_alloc_generic. If max_gen_ptrs is later incremented, it will be caught in net_assign_generic.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 3cdc34d76c4f777579e28ad373979d36c030cfd3Affected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 7b0e64583eab8c1d896b47e5dd0bf2e7d86ec41fAffected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 0c3248bc708a7797be573214065cf908ff1f54c7Affected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 9518b79bfd2fbf99fa9b7e8e36bcb1825e7ba030Affected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 2d60ff5874aefd006717ca5e22ac1e25eac29c42Affected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before b6dbfd5bcc267a95a0bf1bf96af46243f96ec6cdAffected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before f4f94587e1bf87cb40ec33955a9d90148dd026abAffected 073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before a26ff37e624d12e28077e5b24d2b264f62764ad6Affected 561331eae0a03d0c4cf60f3cf485aa3e8aa5ab48Affected a2c82f7bee1ffa9eafa1fb0bd886a7eea8c9e497Affected 3.0.19 to before 3.1Affected 3.2.3 to before 3.3Affected
LinuxLinux	3.3Affected before 3.3Not affected 4.19.314 through 4.19.Not affected 5.4.276 through 5.4.Not affected 5.10.217 through 5.10.Not affected 5.15.159 through 5.15.Not affected 6.1.91 through 6.1.Not affected 6.6.31 through 6.6.Not affected 6.8.10 through 6.8.*Not affected 6.9 and laterNot affected

Product

Versions

LinuxLinux

073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 3cdc34d76c4f777579e28ad373979d36c030cfd3Affected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 7b0e64583eab8c1d896b47e5dd0bf2e7d86ec41fAffected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 0c3248bc708a7797be573214065cf908ff1f54c7Affected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 9518b79bfd2fbf99fa9b7e8e36bcb1825e7ba030Affected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before 2d60ff5874aefd006717ca5e22ac1e25eac29c42Affected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before b6dbfd5bcc267a95a0bf1bf96af46243f96ec6cdAffected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before f4f94587e1bf87cb40ec33955a9d90148dd026abAffected
073862ba5d249c20bd5c49fc6d904ff0e1f6a672 to before a26ff37e624d12e28077e5b24d2b264f62764ad6Affected
561331eae0a03d0c4cf60f3cf485aa3e8aa5ab48Affected
a2c82f7bee1ffa9eafa1fb0bd886a7eea8c9e497Affected
3.0.19 to before 3.1Affected
3.2.3 to before 3.3Affected

LinuxLinux

3.3Affected
before 3.3Not affected
4.19.314 through 4.19.*Not affected
5.4.276 through 5.4.*Not affected
5.10.217 through 5.10.*Not affected
5.15.159 through 5.15.*Not affected
6.1.91 through 6.1.*Not affected
6.6.31 through 6.6.*Not affected
6.8.10 through 6.8.*Not affected
6.9 and laterNot affected

References

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