CVE-2023-54082
- Source
- https://cve.org/CVERecord?id=CVE-2023-54082
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54082.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-54082
- Downstream
- Published
- 2025-12-24T13:06:14.011Z
- Modified
- 2025-12-24T20:44:00.881299Z
- Summary
- af_unix: Fix null-ptr-deref in unix_stream_sendpage().
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
afunix: Fix null-ptr-deref in unixstream_sendpage().
Bing-Jhong Billy Jheng reported null-ptr-deref in unixstreamsendpage() with detailed analysis and a nice repro.
unixstreamsendpage() tries to add data to the last skb in the peer's recv queue without locking the queue.
If the peer's FD is passed to another socket and the socket's FD is passed to the peer, there is a loop between them. If we close both sockets without receiving FD, the sockets will be cleaned up by garbage collection.
The garbage collection iterates such sockets and unlinks skb with FD from the socket's receive queue under the queue's lock.
So, there is a race where unixstreamsendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.
To avoid the issue, unixstreamsendpage() must lock the peer's recv queue.
Note the issue does not exist in 6.5+ thanks to the recent sendpage() refactoring.
This patch is originally written by Linus Torvalds.
BUG: unable to handle page fault for address: ffff988004dd6870 PF: supervisor read access in kernel mode PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 PREEMPT SMP PTI CPU: 4 PID: 297 Comm: garbageuaf Not tainted 6.1.46 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:kmemcachealloc_node+0xa2/0x1e0 Code: c0 0f 84 32 01 00 00 41 83 fd ff 74 10 48 8b 00 48 c1 e8 3a 41 39 c5 0f 85 1c 01 00 00 41 8b 44 24 28 49 8b 3c 24 48 8d 4a 40 <49> 8b 1c 06 4c 89 f0 65 48 0f c7 0f 0f 94 c0 84 c0 74 a1 41 8b 44 RSP: 0018:ffffc9000079fac0 EFLAGS: 00000246 RAX: 0000000000000070 RBX: 0000000000000005 RCX: 000000000001a284 RDX: 000000000001a244 RSI: 0000000000400cc0 RDI: 000000000002eee0 RBP: 0000000000400cc0 R08: 0000000000400cc0 R09: 0000000000000003 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888003970f00 R13: 00000000ffffffff R14: ffff988004dd6800 R15: 00000000000000e8 FS: 00007f174d6f3600(0000) GS:ffff88807db00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff988004dd6870 CR3: 00000000092be000 CR4: 00000000007506e0 PKRU: 55555554 Call Trace: <TASK> ? __diebody.cold+0x1a/0x1f ? pagefaultoops+0xa9/0x1e0 ? fixupexception+0x1d/0x310 ? excpagefault+0xa8/0x150 ? asmexcpagefault+0x22/0x30 ? kmemcacheallocnode+0xa2/0x1e0 ? __alloc_skb+0x16c/0x1e0 __allocskb+0x16c/0x1e0 allocskbwithfrags+0x48/0x1e0 sockallocsendpskb+0x234/0x270 unixstreamsendmsg+0x1f5/0x690 socksendmsg+0x5d/0x60 ____sys_sendmsg+0x210/0x260 ___syssendmsg+0x83/0xd0 ? kmemcachealloc+0xc6/0x1c0 ? avcdisable+0x20/0x20 ? percpucounteraddbatch+0x53/0xc0 ? allocemptyfile+0x5d/0xb0 ? allocfile+0x91/0x170 ? allocfilepseudo+0x94/0x100 ? __fget_light+0x9f/0x120 __syssendmsg+0x54/0xa0 dosyscall64+0x3b/0x90 entrySYSCALL64afterhwframe+0x69/0xd3 RIP: 0033:0x7f174d639a7d Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 8a c1 f4 ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 de c1 f4 ff 48 RSP: 002b:00007ffcb563ea50 EFLAGS: 00000293 ORIGRAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f174d639a7d RDX: 0000000000000000 RSI: 00007ffcb563eab0 RDI: 0000000000000007 RBP: 00007ffcb563eb10 R08: 0000000000000000 R09: 00000000ffffffff R10: 00000000004040a0 R11: 0000000000000293 R12: 00007ffcb563ec28 R13: 0000000000401398 R14: 0000000000403e00 R15: 00007f174d72c000 </TASK>
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54082.json" }- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced869e7c62486ec0e170a9771acaa251d1a33b5871Fixedc080cee930303124624fe64fc504f66c815ee6b9