CVE-2022-49697
published 2025-02-26CVE-2022-49697: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_socket leak…
PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.27%
19.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix request_sock leak in sk lookup helpers
A customer reported a request_socket leak in a Calico cloud environment. We
found that a BPF program was doing a socket lookup with takes a refcnt on
the socket and that it was finding the request_socket but returning the parent
LISTEN socket via sk_to_full_sk() without decrementing the child request socket
1st, resulting in request_sock slab object leak. This patch retains the
existing behaviour of returning full socks to the caller but it also decrements
the child request_socket if one is present before doing so to prevent the leak.
Thanks to Curtis Taylor for all the help in diagnosing and testing this. And
thanks to Antoine Tenart for the reproducer and patch input.
v2 of this patch contains, refactor as per Daniel Borkmann's suggestions to
validate RCU flags on the listen socket so that it balances with bpf_sk_release()
and update comments as per Martin KaFai Lau's suggestion. One small change to
Daniels suggestion, put "sk = sk2" under "if (sk2 != sk)" to avoid an extra
instruction.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.18.14-1 (bookworm) | linux 5.18.14-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= edbf8c01de5a104a71ed6df2bf6421ceb2836a8e < 8ffe2e50e9678c8373027492035f094b130437f1 | 8ffe2e50e9678c8373027492035f094b130437f1 |
| linux | linux | >= edbf8c01de5a104a71ed6df2bf6421ceb2836a8e < 516760f1d2979903eaad5b437256913c5cd98416 | 516760f1d2979903eaad5b437256913c5cd98416 |
| linux | linux | >= edbf8c01de5a104a71ed6df2bf6421ceb2836a8e < b03607437ea81b850599f705096b05b85e7a4a71 | b03607437ea81b850599f705096b05b85e7a4a71 |
| linux | linux | >= edbf8c01de5a104a71ed6df2bf6421ceb2836a8e < 5a62b5ba4c0ce8315b6382cd4ace81b48cd121cd | 5a62b5ba4c0ce8315b6382cd4ace81b48cd121cd |
| linux | linux | >= edbf8c01de5a104a71ed6df2bf6421ceb2836a8e < 3046a827316c0e55fc563b4fb78c93b9ca5c7c37 | 3046a827316c0e55fc563b4fb78c93b9ca5c7c37 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.127-1 | 5.10.127-1 |
| linux | linux_kernel | >= 0 < 5.18.14-1 | 5.18.14-1 |
| linux | linux_kernel | >= 0 < 5.18.14-1 | 5.18.14-1 |
| linux | linux_kernel | >= 0 < 5.18.14-1 | 5.18.14-1 |
| linux | linux_kernel | >= 5.11 < 5.15.51 | 5.15.51 |
| linux | linux_kernel | >= 5.16 < 5.18.8 | 5.18.8 |
| linux | linux_kernel | >= 5.2 < 5.4.202 | 5.4.202 |
| linux | linux_kernel | >= 5.5 < 5.10.127 | 5.10.127 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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Red Hat
kernel: bpf: Fix request_sock leak in sk lookup helpers
vendor_redhat·2025-02-26·CVSS 5.5
CVE-2022-49697 [MEDIUM] kernel: bpf: Fix request_sock leak in sk lookup helpers
kernel: bpf: Fix request_sock leak in sk lookup helpers
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix request_sock leak in sk lookup helpers
A customer reported a request_socket leak in a Calico cloud environment. We
found that a BPF program was doing a socket lookup with takes a refcnt on
the socket and that it was finding the request_socket but returning the parent
LISTEN socket via sk_to_full_sk() without decrementing the child request socket
1st, resulting in request_sock slab object leak. This patch retains the
existing behaviour of returning full socks to the caller but it also decrements
the child request_socket if one is present before doing so to prevent the leak.
Thanks to Curtis Taylor for all the help in diagnosing and testing this. And
thanks to
Debian
CVE-2022-49697: linux - In the Linux kernel, the following vulnerability has been resolved: bpf: Fix re...
vendor_debian·2022·CVSS 5.5
CVE-2022-49697 [MEDIUM] CVE-2022-49697: linux - In the Linux kernel, the following vulnerability has been resolved: bpf: Fix re...
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_socket leak in a Calico cloud environment. We found that a BPF program was doing a socket lookup with takes a refcnt on the socket and that it was finding the request_socket but returning the parent LISTEN socket via sk_to_full_sk() without decrementing the child request socket 1st, resulting in request_sock slab object leak. This patch retains the existing behaviour of returning full socks to the caller but it also decrements the child request_socket if one is present before doing so to prevent the leak. Thanks to Curtis Taylor for all the help in diagnosing and testing this. And thanks to Antoine Tenart for the reproducer and patch input. v2 of
GHSA
GHSA-p47r-wjhf-x2fg: In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix request_sock leak in sk lookup helpers
A customer reported a request_so
ghsa_unreviewed·2025-10-24
CVE-2022-49697 [MEDIUM] CWE-401 GHSA-p47r-wjhf-x2fg: In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix request_sock leak in sk lookup helpers
A customer reported a request_so
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix request_sock leak in sk lookup helpers
A customer reported a request_socket leak in a Calico cloud environment. We
found that a BPF program was doing a socket lookup with takes a refcnt on
the socket and that it was finding the request_socket but returning the parent
LISTEN socket via sk_to_full_sk() without decrementing the child request socket
1st, resulting in request_sock slab object leak. This patch retains the
existing behaviour of returning full socks to the caller but it also decrements
the child request_socket if one is present before doing so to prevent the leak.
Thanks to Curtis Taylor for all the help in diagnosing and testing this. And
thanks to Antoine Tenart for the reproducer and patch input.
v
OSV
CVE-2022-49697: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_sock
osv·2025-02-26·CVSS 5.5
CVE-2022-49697 [MEDIUM] CVE-2022-49697: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_sock
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_socket leak in a Calico cloud environment. We found that a BPF program was doing a socket lookup with takes a refcnt on the socket and that it was finding the request_socket but returning the parent LISTEN socket via sk_to_full_sk() without decrementing the child request socket 1st, resulting in request_sock slab object leak. This patch retains the existing behaviour of returning full socks to the caller but it also decrements the child request_socket if one is present before doing so to prevent the leak. Thanks to Curtis Taylor for all the help in diagnosing and testing this. And thanks to Antoine Tenart for the reproducer and patch input. v2 of
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/3046a827316c0e55fc563b4fb78c93b9ca5c7c37https://git.kernel.org/stable/c/516760f1d2979903eaad5b437256913c5cd98416https://git.kernel.org/stable/c/5a62b5ba4c0ce8315b6382cd4ace81b48cd121cdhttps://git.kernel.org/stable/c/8ffe2e50e9678c8373027492035f094b130437f1https://git.kernel.org/stable/c/b03607437ea81b850599f705096b05b85e7a4a71
2025-02-26
Published