net: restrict SO_RESERVE_MEM to TCP sockets and cap max value

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Summary

CVECVE-2026-98801
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:34 UTC
Updated2026-10-19 10:19:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: restrict SO_RESERVE_MEM to TCP sockets and cap max value Commit 2bb2f5fb21b0 ("net: add new socket option SO_RESERVE_MEM") and commit d00c8ee31729 ("net: fix possible NULL deref in sock_reserve_memory") only checked sk_has_account(sk), which is true for both TCP and UDP sockets. However, SO_RESERVE_MEM and sk_unused_reserved_mem() are currently only supported by TCP: - On UDP sockets, sk->sk_forward_alloc is protected by sk->sk_receive_queue.lock, whereas sock_reserve_memory() and sock_release_reserved_memory() only acquire lock_sock(sk). Concurrent UDP packet reception/release and setsockopt(SO_RESERVE_MEM) corrupt sk_forward_alloc and memcg accounting. - udp_rmem_release() reclaims excess sk_forward_alloc without accounting for sk_unused_reserved_mem(sk). Restrict sock_reserve_memory() to TCP sockets (sk_is_tcp(sk)) for now. Supporting SO_RESERVE_MEM for UDP (acquiring sk_receive_queue.lock and honoring sk_unused_reserved_mem() in udp_rmem_release()) can be done in a future net-next series if needed. In addition, reject val > SZ_1G with -EINVAL in sk_setsockopt(SO_RESERVE_MEM). Without an upper bound, values near INT_MAX cause sk_mem_pages(delta) and (pages << PAGE_SHIFT) to overflow 32-bit signed int, corrupting sk->sk_forward_alloc and sk->sk_reserved_mem. Using a page-aligned cap (SZ_1G) ensures that the page-rounded sk->sk_reserved_mem reported by getsockopt(SO_RESERVE_MEM) can always be passed back to setsockopt(SO_RESERVE_MEM).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 492e04f9a00f3cc88a1f6899417b10f3019a624e git Not specified
CNA Linux Linux affected 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 5069ce898148bd799395c5a464e006cbb840f188 git Not specified
CNA Linux Linux affected 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 a467b05b201b5c26be52ed3081992fa9c0387648 git Not specified
CNA Linux Linux affected 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 37e02c42a00be692c06343e11779aadc45f45971 git Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/492e04f9a00f3cc88a1f6899417b10f3019a624e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5069ce898148bd799395c5a464e006cbb840f188 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37e02c42a00be692c06343e11779aadc45f45971 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a467b05b201b5c26be52ed3081992fa9c0387648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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