CVE-2024-40958
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-40958
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-40958.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-40958
- Downstream
- Related
- Published
- 2024-07-12T12:32:00Z
- Modified
- 2025-10-17T10:03:04.989035Z
- Summary
- netns: Make get_net_ns() handle zero refcount net
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
netns: Make getnetns() handle zero refcount net
Syzkaller hit a warning: refcountt: addition on 0; use-after-free. WARNING: CPU: 3 PID: 7890 at lib/refcount.c:25 refcountwarnsaturate+0xdf/0x1d0 Modules linked in: CPU: 3 PID: 7890 Comm: tun Not tainted 6.10.0-rc3-00100-gcaa4f9578aba-dirty #310 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:refcountwarnsaturate+0xdf/0x1d0 Code: 41 49 04 31 ff 89 de e8 9f 1e cd fe 84 db 75 9c e8 76 26 cd fe c6 05 b6 41 49 04 01 90 48 c7 c7 b8 8e 25 86 e8 d2 05 b5 fe 90 <0f> 0b 90 90 e9 79 ff ff ff e8 53 26 cd fe 0f b6 1 RSP: 0018:ffff8881067b7da0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff811c72ac RDX: ffff8881026a2140 RSI: ffffffff811c72b5 RDI: 0000000000000001 RBP: ffff8881067b7db0 R08: 0000000000000000 R09: 205b5d3730353139 R10: 0000000000000000 R11: 205d303938375420 R12: ffff8881086500c4 R13: ffff8881086500c4 R14: ffff8881086500b0 R15: ffff888108650040 FS: 00007f5b2961a4c0(0000) GS:ffff88823bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d7ed36fd18 CR3: 00000001482f6000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ? showregs+0xa3/0xc0 ? _warn+0xa5/0x1c0 ? refcountwarnsaturate+0xdf/0x1d0 ? reportbug+0x1fc/0x2d0 ? refcountwarnsaturate+0xdf/0x1d0 ? handlebug+0xa1/0x110 ? excinvalidop+0x3c/0xb0 ? asmexcinvalidop+0x1f/0x30 ? _warnprintk+0xcc/0x140 ? _warnprintk+0xd5/0x140 ? refcountwarnsaturate+0xdf/0x1d0 getnetns+0xa4/0xc0 ? _pfxgetnetns+0x10/0x10 openrelatedns+0x5a/0x130 _tunchrioctl+0x1616/0x2370 ? _sanitizercovtraceswitch+0x58/0xa0 ? _sanitizercovtraceconstcmp2+0x1c/0x30 ? _pfxtunchrioctl+0x10/0x10 tunchrioctl+0x2f/0x40 _x64sysioctl+0x11b/0x160 x64syscall+0x1211/0x20d0 dosyscall64+0x9e/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f RIP: 0033:0x7f5b28f165d7 Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 8 RSP: 002b:00007ffc2b59c5e8 EFLAGS: 00000246 ORIGRAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5b28f165d7 RDX: 0000000000000000 RSI: 00000000000054e3 RDI: 0000000000000003 RBP: 00007ffc2b59c650 R08: 00007f5b291ed8c0 R09: 00007f5b2961a4c0 R10: 0000000029690010 R11: 0000000000000246 R12: 0000000000400730 R13: 00007ffc2b59cf40 R14: 0000000000000000 R15: 0000000000000000 </TASK> Kernel panic - not syncing: kernel: paniconwarn set ...
This is trigger as below: ns0 ns1 tunsetiff() //dev is tun0 tun->dev = dev //ip link set tun0 netns ns1 putnet() //ref is 0 _tunchrioctl() //TUNGETDEVNETNS net = devnet(tun->dev); openrelatedns(&net->ns, getnetns); //ns1 getnetns() getnet() //addition on 0
Use maybegetnet() in getnetns in case net's ref is zero to fix this
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1b631bffcb2c09551888f3c723f4365c91fe05ef
- https://git.kernel.org/stable/c/2b82028a1f5ee3a8e04090776b10c534144ae77b
- https://git.kernel.org/stable/c/3a6cd326ead7c8bb1f64486789a01974a9f1ad55
- https://git.kernel.org/stable/c/3af28df0d883e8c89a29ac31bc65f9023485743b
- https://git.kernel.org/stable/c/cb7f811f638a14590ff98f53c6dd1fb54627d940
- https://git.kernel.org/stable/c/ef0394ca25953ea0eddcc82feae1f750451f1876
- https://git.kernel.org/stable/c/ff960f9d3edbe08a736b5a224d91a305ccc946b0
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
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixed3a6cd326ead7c8bb1f64486789a01974a9f1ad55
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixed2b82028a1f5ee3a8e04090776b10c534144ae77b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixedcb7f811f638a14590ff98f53c6dd1fb54627d940
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixed1b631bffcb2c09551888f3c723f4365c91fe05ef
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixedef0394ca25953ea0eddcc82feae1f750451f1876
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixed3af28df0d883e8c89a29ac31bc65f9023485743b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c3e0e3bb623c3735b8c9ab8aa8332f944f83a9fFixedff960f9d3edbe08a736b5a224d91a305ccc946b0
Affected versions
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced5.2.0Fixed5.4.279
- Type
- ECOSYSTEM
- Events
-
Introduced5.5.0Fixed5.10.221
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed5.15.162
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.1.96
- Type
- ECOSYSTEM
- Events
-
Introduced6.2.0Fixed6.6.36
- Type
- ECOSYSTEM
- Events
-
Introduced6.7.0Fixed6.9.7