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Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sk_select_reuseport() memory leak As pointed out in the original comment, lookup in sockmap can return a TCP ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb does not imply a non-refcounted socket. Drop sk's reference in both error paths. unreferenced object 0xffff888101911800 (size 2048): comm "test_progs", pid 44109, jiffies 4297131437 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e

PUBLISHED Reserved 2024-12-29 | Published 2025-01-31 | Updated 2025-11-03 | Assigner Linux

Product status

Default status
unaffected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before bb36838dac7bb334a3f3d7eb29875593ec9473fc
affected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf
affected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before d0a3b3d1176d39218b8edb2a2d03164942ab9ccd
affected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before b02e70be498b138e9c21701c2f33f4018ca7cd5e
affected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before cccd51dd22574216e64e5d205489e634f86999f3
affected

64d85290d79c0677edb5a8ee2295b36c022fa5df (git) before b3af60928ab9129befa65e6df0310d27300942bf
affected

Default status
affected

5.8
affected

Any version before 5.8
unaffected

5.10.234 (semver)
unaffected

5.15.177 (semver)
unaffected

6.1.127 (semver)
unaffected

6.6.74 (semver)
unaffected

6.12.11 (semver)
unaffected

6.13 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/03/msg00001.html

lists.debian.org/debian-lts-announce/2025/03/msg00002.html

git.kernel.org/...c/bb36838dac7bb334a3f3d7eb29875593ec9473fc

git.kernel.org/...c/0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf

git.kernel.org/...c/d0a3b3d1176d39218b8edb2a2d03164942ab9ccd

git.kernel.org/...c/b02e70be498b138e9c21701c2f33f4018ca7cd5e

git.kernel.org/...c/cccd51dd22574216e64e5d205489e634f86999f3

git.kernel.org/...c/b3af60928ab9129befa65e6df0310d27300942bf

cve.org (CVE-2025-21683)

nvd.nist.gov (CVE-2025-21683)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.