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net/sched: act_skbmod: prevent kernel-infoleak

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: prevent kernel-infoleak syzbot found that tcf_skbmod_dump() was copying four bytes from kernel stack to user space [1]. The issue here is that 'struct tc_skbmod' has a four bytes hole. We need to clear the structure before filling fields. [1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:196 [inline] simple_copy_to_iter net/core/datagram.c:532 [inline] __skb_datagram_iter+0x185/0x1000 net/core/datagram.c:420 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546 skb_copy_datagram_msg include/linux/skbuff.h:4050 [inline] netlink_recvmsg+0x432/0x1610 net/netlink/af_netlink.c:1962

Announced Source revision 1
Original source ↗

CVE-2024-35893

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-35893

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "f190a4aa03cbd518bd9c62a66e1233984f5fd2ec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "f356eb2fb567e0931143ac1769ac802d3b3e2077",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "5e45dc4408857305f4685abfd7a528a1e58b51b5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "a097fc199ab5f4b5392c5144034c0d2148b55a14",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "55d3fe7b2b7bc354e7cbc1f7b8f98a29ccd5a366",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "729ad2ac2a2cdc9f4a4bdfd40bfd276e6bc33924",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "7bb2c7103d8c13b06a57bf997b8cdbe93cd7283c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "86da71b57383d40993cb90baafb3735cffe5d800",
        "lessThan": "d313eb8b77557a6d5855f42d2234bd592c7b50dd",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/act_skbmod.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.19.312",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.274",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.154",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.85",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.26",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/act_skbmod.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-35893

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26531 · Revision 1
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Publisher date
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