CVE-2024-49947
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-49947
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49947.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-49947
- Downstream
- Related
- Published
- 2024-10-21T18:02:04Z
- Modified
- 2025-10-17T15:21:33.223921Z
- Summary
- net: test for not too small csum_start in virtio_net_hdr_to_skb()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: test for not too small csumstart in virtionethdrto_skb()
syzbot was able to trigger this warning [1], after injecting a malicious packet through afpacket, setting skb->csumstart and thus the transport header to an incorrect value.
We can at least make sure the transport header is after the end of the network header (with a estimated minimal size).
[1] [ 67.873027] skb len=4096 headroom=16 headlen=14 tailroom=0 mac=(-1,-1) maclen=0 net=(16,-6) trans=10 shinfo(txflags=0 nrfrags=1 gso(size=0 type=0 segs=0)) csum(0xa start=10 offset=0 ipsummed=3 completesw=0 valid=0 level=0) hash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0 priority=0x0 mark=0x0 alloccpu=10 vlanall=0x0 encapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0) [ 67.877172] dev name=veth0vlan feat=0x000061164fdd09e9 [ 67.877764] sk family=17 type=3 proto=0 [ 67.878279] skb linear: 00000000: 00 00 10 00 00 00 00 00 0f 00 00 00 08 00 [ 67.879128] skb frag: 00000000: 0e 00 07 00 00 00 28 00 08 80 1c 00 04 00 00 02 [ 67.879877] skb frag: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.880647] skb frag: 00000020: 00 00 02 00 00 00 08 00 1b 00 00 00 00 00 00 00 [ 67.881156] skb frag: 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.881753] skb frag: 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.882173] skb frag: 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.882790] skb frag: 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.883171] skb frag: 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.883733] skb frag: 00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.884206] skb frag: 00000090: 00 00 00 00 00 00 00 00 00 00 69 70 76 6c 61 6e [ 67.884704] skb frag: 000000a0: 31 00 00 00 00 00 00 00 00 00 2b 00 00 00 00 00 [ 67.885139] skb frag: 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.885677] skb frag: 000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.886042] skb frag: 000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.886408] skb frag: 000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.887020] skb frag: 000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 67.887384] skb frag: 00000100: 00 00 [ 67.887878] ------------[ cut here ]------------ [ 67.887908] offset (-6) >= skbheadlen() (14) [ 67.888445] WARNING: CPU: 10 PID: 2088 at net/core/dev.c:3332 skbchecksumhelp (net/core/dev.c:3332 (discriminator 2)) [ 67.889353] Modules linked in: macsec macvtap macvlan hsr wireguard curve25519x8664 libcurve25519generic libchacha20poly1305 chachax8664 libchacha poly1305x8664 dummy bridge srmod cdrom evdev pcspkr i2cpiix4 9pnetvirtio 9p 9pnet netfs [ 67.890111] CPU: 10 UID: 0 PID: 2088 Comm: b363492833 Not tainted 6.11.0-virtme #1011 [ 67.890183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 67.890309] RIP: 0010:skbchecksumhelp (net/core/dev.c:3332 (discriminator 2)) [ 67.891043] Call Trace: [ 67.891173] <TASK> [ 67.891274] ? _warn (kernel/panic.c:741) [ 67.891320] ? skbchecksumhelp (net/core/dev.c:3332 (discriminator 2)) [ 67.891333] ? reportbug (lib/bug.c:180 lib/bug.c:219) [ 67.891348] ? handlebug (arch/x86/kernel/traps.c:239) [ 67.891363] ? excinvalidop (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 67.891372] ? asmexcinvalidop (./arch/x86/include/asm/idtentry.h:621) [ 67.891388] ? skbchecksumhelp (net/core/dev.c:3332 (discriminator 2)) [ 67.891399] ? skbchecksumhelp (net/core/dev.c:3332 (discriminator 2)) [ 67.891416] ipdofragment (net/ipv4/ipoutput.c:777 (discriminator 1)) [ 67.891448] ? _iplocalout (./include/linux/skbuff.h:1146 ./include/net/l3mdev.h:196 ./include/net/l3mdev.h:213 ne ---truncated---
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/49d14b54a527289d09a9480f214b8c586322310a
- https://git.kernel.org/stable/c/4cc0648e9e3240496835dc698ace1d046d8d57ea
- https://git.kernel.org/stable/c/7711c419a915ee0dd91c125d2b967bbf2a72e9ac
- https://git.kernel.org/stable/c/d9dfd41e32ccc5198033ddd1ff1516822dfefa5a
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
-
Introduced342c88f406c2acd3dd00767aeacafe883cebb374Fixedd9dfd41e32ccc5198033ddd1ff1516822dfefa5a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9181d6f8a2bb32d158de66a84164fac05e3ddd18Fixed4cc0648e9e3240496835dc698ace1d046d8d57ea
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9181d6f8a2bb32d158de66a84164fac05e3ddd18Fixed7711c419a915ee0dd91c125d2b967bbf2a72e9ac
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9181d6f8a2bb32d158de66a84164fac05e3ddd18Fixed49d14b54a527289d09a9480f214b8c586322310a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast affected765290b628c2fb764bdfaf8088754439665751e8