Answer in brief
CVE-2026-68284 records a High severity (CVSS 7.8) vulnerability in bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=604326b41a6fb9b4a78b6179335decee0365cd8c <ee762f684eefa59de34d9ed93cab08336e834f47 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <cde4d6bcd9b73073c66498f6723c7b364c4dbc18 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <786d690257ec7a0c839f8710456e444ce3f1348b || >=604326b41a6fb9b4a78b6179335decee0365cd8c <752b1159ed5d0c48fe169a3721b96660a9822aa1 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <2d66a033864e27ab8d5e44cb36f31d9d2413bee4 | ee762f684eefa59de34d9ed93cab08336e834f47, cde4d6bcd9b73073c66498f6723c7b364c4dbc18, 786d690257ec7a0c839f8710456e444ce3f1348b, 752b1159ed5d0c48fe169a3721b96660a9822aa1, 2d66a033864e27ab8d5e44cb36f31d9d2413bee4 |
| Linux/Linuxgeneric | 4.20 | Not reported |
| Linux/Linuxgeneric | >=604326b41a6fb9b4a78b6179335decee0365cd8c <0688e6fe599d2d39147ae9ece97944c6e1815ebf || >=604326b41a6fb9b4a78b6179335decee0365cd8c <b2bcbeabfd843d47468fa095b1bd08ddb90cf616 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <54be47e7cbb936429c3bbdfc526ea943954aaf80 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <ee762f684eefa59de34d9ed93cab08336e834f47 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <cde4d6bcd9b73073c66498f6723c7b364c4dbc18 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <786d690257ec7a0c839f8710456e444ce3f1348b || >=604326b41a6fb9b4a78b6179335decee0365cd8c <752b1159ed5d0c48fe169a3721b96660a9822aa1 || >=604326b41a6fb9b4a78b6179335decee0365cd8c <2d66a033864e27ab8d5e44cb36f31d9d2413bee4 | 0688e6fe599d2d39147ae9ece97944c6e1815ebf, b2bcbeabfd843d47468fa095b1bd08ddb90cf616, 54be47e7cbb936429c3bbdfc526ea943954aaf80, ee762f684eefa59de34d9ed93cab08336e834f47, cde4d6bcd9b73073c66498f6723c7b364c4dbc18, 786d690257ec7a0c839f8710456e444ce3f1348b, 752b1159ed5d0c48fe169a3721b96660a9822aa1, 2d66a033864e27ab8d5e44cb36f31d9d2413bee4 |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.