bpf: Fix bpf_sk_select_reuseport() memory leak
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in bb36838dac7bb334a3f3d7eb29875593ec9473fc; From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf; From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in d0a3b3d1176d39218b8edb2a2d03164942ab9ccd; From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in b02e70be498b138e9c21701c2f33f4018ca7cd5e; From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in cccd51dd22574216e64e5d205489e634f86999f3; From 64d85290d79c0677edb5a8ee2295b36c022fa5df · fixed in b3af60928ab9129befa65e6df0310d27300942bf
- Linux Linux
5.8
- KernelLinux
From 5.8.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.127; From 6.2.0 · fixed in 6.6.74; From 6.7.0 · fixed in 6.12.11