CVE-2026-68284High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg() tcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which drops and reacquires the socket lock. …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()
tcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which drops and reacquires the socket lock. Its error path tries to decide whether msg_tx names the local temporary message by comparing it with the current value of psock->cork.
This comparison is unsafe when two threads send on the same socket:
Thread A Thread B msg_tx = psock->cork sk_msg_alloc() fails sk_stream_wait_memory() releases the socket lock acquires the socket lock completes the cork psock->cork = NULL frees the cork reacquires the socket lock msg_tx != psock->cork sk_msg_free(msg_tx)
The stale cork is therefore mistaken for the local temporary message and freed again. KASAN reported:
BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50 Read of size 4 at addr ffff88810c908800 by task poc/90 Call Trace: sk_msg_free+0x49/0x50 tcp_bpf_sendmsg+0x14f5/0x1cc0 __sys_sendto+0x32c/0x3a0 __x64_sys_sendto+0xdb/0x1b0 Allocated by task 89: __kasan_kmalloc+0x8f/0xa0 tcp_bpf_sendmsg+0x16b3/0x1cc0 Freed by task 91: __kasan_slab_free+0x43/0x70 kfree+0x131/0x3c0 tcp_bpf_sendmsg+0xec3/0x1cc0
msg_tx can only name the stack-local tmp or the shared cork. Check for tmp directly so a changed psock->cork cannot turn a shared message into an apparent local one.
Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < 0688e6fe599d2d39147ae9ece97944c6e1815ebfLinux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < b2bcbeabfd843d47468fa095b1bd08ddb90cf616Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < 54be47e7cbb936429c3bbdfc526ea943954aaf80Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < ee762f684eefa59de34d9ed93cab08336e834f47Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < cde4d6bcd9b73073c66498f6723c7b364c4dbc18Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < 786d690257ec7a0c839f8710456e444ce3f1348bLinux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < 752b1159ed5d0c48fe169a3721b96660a9822aa1Linux >= 604326b41a6fb9b4a78b6179335decee0365cd8c < 2d66a033864e27ab8d5e44cb36f31d9d2413bee4Linux 4.20Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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