Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 18 Mar 2024 11:18:33 +0100 | Subject | Re: CVE-2021-47115: nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect | From | Robert Frohl <> |
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Hi all,
CVE-2021-47115 looks like a duplicate of CVE-2021-38208 [0].
Cheers, Robert
[0] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38208
On 15.03.24 21:15, Greg Kroah-Hartman wrote: > Description > =========== > > In the Linux kernel, the following vulnerability has been resolved: > > nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect > > It's possible to trigger NULL pointer dereference by local unprivileged > user, when calling getsockname() after failed bind() (e.g. the bind > fails because LLCP_SAP_MAX used as SAP): > > BUG: kernel NULL pointer dereference, address: 0000000000000000 > CPU: 1 PID: 426 Comm: llcp_sock_getna Not tainted 5.13.0-rc2-next-20210521+ #9 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014 > Call Trace: > llcp_sock_getname+0xb1/0xe0 > __sys_getpeername+0x95/0xc0 > ? lockdep_hardirqs_on_prepare+0xd5/0x180 > ? syscall_enter_from_user_mode+0x1c/0x40 > __x64_sys_getpeername+0x11/0x20 > do_syscall_64+0x36/0x70 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > This can be reproduced with Syzkaller C repro (bind followed by > getpeername): > https://syzkaller.appspot.com/x/repro.c?x=14def446e00000 > > The Linux kernel CVE team has assigned CVE-2021-47115 to this issue. > > > Affected and fixed versions > =========================== > > Issue introduced in 3.3 with commit d646960f7986 and fixed in 4.4.272 with commit eb6875d48590 > Issue introduced in 3.3 with commit d646960f7986 and fixed in 4.9.272 with commit 39c15bd2e5d1 > Issue introduced in 3.3 with commit d646960f7986 and fixed in 4.14.236 with commit ffff05b9ee5c > Issue introduced in 3.3 with commit d646960f7986 and fixed in 4.19.194 with commit 93e4ac2a9979 > Issue introduced in 3.3 with commit d646960f7986 and fixed in 5.4.125 with commit 5d4c4b06ed9f > Issue introduced in 3.3 with commit d646960f7986 and fixed in 5.10.43 with commit 48ee0db61c82 > Issue introduced in 3.3 with commit d646960f7986 and fixed in 5.12.10 with commit 0c4559736d9a > Issue introduced in 3.3 with commit d646960f7986 and fixed in 5.13 with commit 4ac06a1e013c > > Please see https://www.kernel.org or a full list of currently supported > kernel versions by the kernel community. > > Unaffected versions might change over time as fixes are backported to > older supported kernel versions. The official CVE entry at > https://cve.org/CVERecord/?id=CVE-2021-47115 > will be updated if fixes are backported, please check that for the most > up to date information about this issue. > > > Affected files > ============== > > The file(s) affected by this issue are: > net/nfc/llcp_sock.c > > > Mitigation > ========== > > The Linux kernel CVE team recommends that you update to the latest > stable kernel version for this, and many other bugfixes. Individual > changes are never tested alone, but rather are part of a larger kernel > release. Cherry-picking individual commits is not recommended or > supported by the Linux kernel community at all. If however, updating to > the latest release is impossible, the individual changes to resolve this > issue can be found at these commits: > https://git.kernel.org/stable/c/eb6875d48590d8e564092e831ff07fa384d7e477 > https://git.kernel.org/stable/c/39c15bd2e5d11bcf7f4c3dba2aad9e1e110a5d94 > https://git.kernel.org/stable/c/ffff05b9ee5c74c04bba2801c1f99b31975d74d9 > https://git.kernel.org/stable/c/93e4ac2a9979a9a4ecc158409ed9c3044dc0ae1f > https://git.kernel.org/stable/c/5d4c4b06ed9fb7a69d0b2e2a73fc73226d25ab70 > https://git.kernel.org/stable/c/48ee0db61c8299022ec88c79ad137f290196cac2 > https://git.kernel.org/stable/c/0c4559736d9a4ec1ca58ba98ca34e7c4da4c422b > https://git.kernel.org/stable/c/4ac06a1e013cf5fdd963317ffd3b968560f33bba >
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