Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 18 Mar 2024 10:35:42 +0000 | From | Lee Jones <> | Subject | Re: CVE-2021-47115: nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect |
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On Mon, 18 Mar 2024, Robert Frohl wrote:
> Hi all, > > CVE-2021-47115 looks like a duplicate of CVE-2021-38208 [0].
CVE-2021-47115 now rejected, thank you for the report Robert.
https://lore.kernel.org/all/20240318103331.2845054-2-lee@kernel.org/
> 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 > > > > -- > Security Engineer, SUSE Software Solutions Germany GmbH, Frankenstraße 146, > 90461 Nürnberg, Germany, GF: Ivo Totev, Andrew McDonald, Werner Knoblich > (HRB 36809, AG Nürnberg) > GPG: D29F 82AA 9FD5 9D6E 74B1 6370 089E DB3D 230A 2404
-- Lee Jones [李琼斯]
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