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PUBLISHED

CVE-2021-47295

net: sched: fix memory leak in tcindex_partial_destroy_work

Reserved:2024-05-21
Published:2024-05-21
Updated:2024-06-06

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms(). The problem was in non-freed perfect hash in tcindex_partial_destroy_work(). In tcindex_set_parms() new tcindex_data is allocated and some fields from old one are copied to new one, but not the perfect hash. Since tcindex_partial_destroy_work() is the destroy function for old tcindex_data, we need to free perfect hash to avoid memory leak.

Product status

Default status
unaffected

331b72922c5f before 8d7924ce85ba
affected

331b72922c5f before 8e9662fde6d6
affected

331b72922c5f before cac71d27745f
affected

331b72922c5f before f5051bcece50
affected

Default status
affected

3.18
affected

Any version before 3.18
unaffected

5.4.136
unaffected

5.10.54
unaffected

5.13.6
unaffected

5.14
unaffected

References

https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62

https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b

https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1

https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32

cve.org CVE-2021-47295

nvd.nist.gov CVE-2021-47295

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