CVE-2021-47295

net: sched: fix memory leak in tcindex_partial_destroy_work

State: Published
Severity: 7.5 High
Published: May 21, 2024
Updated: May 11, 2026
Reserved: May 21, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
LinuxLinux	331b72922c5f58d48fd5500acadc91777cc31970 to before 53af9c793f644d5841d84d8e0ad83bd7ab47f3e0Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before 01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77bAffected 331b72922c5f58d48fd5500acadc91777cc31970 to before 8d7924ce85bae64e7a67c366c7c50840f49f3a62Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before 7a6fb69bbcb21e9ce13bdf18c008c268874f0480Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before 8e9662fde6d63c78eb1350f6167f64c9d71a865bAffected 331b72922c5f58d48fd5500acadc91777cc31970 to before 18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before cac71d27745f92ee13f0ecc668ffe151a4a9c9b1Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before f5051bcece50140abd1a11a2d36dc3ec5484fc32Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before 7c183dc0af472dec33d2c0786a5e356baa8cad19Affected 331b72922c5f58d48fd5500acadc91777cc31970 to before 3abebc503a5148072052c229c6b04b329a420ecdAffected 331b72922c5f58d48fd5500acadc91777cc31970 to before 372ae77cf11d11fb118cbe2d37def9dd5f826abdAffected
LinuxLinux	3.18Affected before 3.18Not affected 4.14.308 through 4.14.Not affected 4.19.276 through 4.19.Not affected 5.4.136 through 5.4.Not affected 5.4.235 through 5.4.Not affected 5.10.54 through 5.10.Not affected 5.10.173 through 5.10.Not affected 5.13.6 through 5.13.Not affected 5.15.100 through 5.15.Not affected 6.1.18 through 6.1.Not affected 6.2.5 through 6.2.Not affected 5.14 and laterNot affected

Product

Versions

LinuxLinux

331b72922c5f58d48fd5500acadc91777cc31970 to before 53af9c793f644d5841d84d8e0ad83bd7ab47f3e0Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before 01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77bAffected
331b72922c5f58d48fd5500acadc91777cc31970 to before 8d7924ce85bae64e7a67c366c7c50840f49f3a62Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before 7a6fb69bbcb21e9ce13bdf18c008c268874f0480Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before 8e9662fde6d63c78eb1350f6167f64c9d71a865bAffected
331b72922c5f58d48fd5500acadc91777cc31970 to before 18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before cac71d27745f92ee13f0ecc668ffe151a4a9c9b1Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before f5051bcece50140abd1a11a2d36dc3ec5484fc32Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before 7c183dc0af472dec33d2c0786a5e356baa8cad19Affected
331b72922c5f58d48fd5500acadc91777cc31970 to before 3abebc503a5148072052c229c6b04b329a420ecdAffected
331b72922c5f58d48fd5500acadc91777cc31970 to before 372ae77cf11d11fb118cbe2d37def9dd5f826abdAffected

LinuxLinux

3.18Affected
before 3.18Not affected
4.14.308 through 4.14.*Not affected
4.19.276 through 4.19.*Not affected
5.4.136 through 5.4.*Not affected
5.4.235 through 5.4.*Not affected
5.10.54 through 5.10.*Not affected
5.10.173 through 5.10.*Not affected
5.13.6 through 5.13.*Not affected
5.15.100 through 5.15.*Not affected
6.1.18 through 6.1.*Not affected
6.2.5 through 6.2.*Not affected
5.14 and laterNot affected

References

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